How to determine reason for shutdown

Hi all,
My Mac Pro seems to shutdown unexpectedly on occasion and I'm at a loss to explain why.  It happens late at night and though I'm not sure, perhaps only early morning on Thursdays.  Now, I've checked to see if the Energy Saver settings have a scheduled shutdown, and there isn't anything checked there, so it's not something that I've intentionally set.  I don't believe there was a power failure or any similar external cause.  I assume I want to look in the system logs to find the reason for the shutdown, but I can't seem to find the event.  Where exactly should I look and what keyword would I search for.  Any thoughts? 
PS This happened a few times while still running 10.6 as well, so I don't think it's a 10.7 specific issue, but that is what I'm running now.
DC

I have never tried rebooting and leaving it alone for any length of time.  It doesn't happen often enough for me to be able to test that reliably, though I could try it next Wed. night since that seems to be the preferred night.  Thing is, I don't think it happens every week even.  I guess what I should do is do a manual shutdown and then look in the logs for where that info is stored and the trace back over the last 24 hours to see if I can find where it happened.
Not sure what you're looking for in the top command, but here you are.  Couldn't quite squeeze everything in, looks like there's a dozen and a half processes left at the bottom that were past the pagination.
Processes: 113 total, 7 running, 3 stuck, 103 sleeping, 565 threads                      14:39:07
Load Avg: 2.98, 2.65, 2.53  CPU usage: 10.61% user, 3.65% sys, 85.72% idle
SharedLibs: 15M resident, 7768K data, 0B linkedit.
MemRegions: 22095 total, 1821M resident, 65M private, 575M shared.
PhysMem: 1077M wired, 2669M active, 1555M inactive, 5301M used, 6975M free.
VM: 274G vsize, 1120M framework vsize, 132510(0) pageins, 0(0) pageouts.
Networks: packets: 78838/37M in, 74872/19M out. Disks: 2646089/28G read, 2510875/19G written.
PID    COMMAND      %CPU TIME     #TH   #WQ  #POR #MREG RPRVT  RSHRD  RSIZE  VPRVT  VSIZE  PGRP
26916  sed          0.0  00:00.00 1     0    17+  22+   268K+  240K+  556K+  17M+   2378M+ 26913
26915  sed          0.0  00:00.00 1     0    17+  22+   268K+  240K+  556K+  17M+   2378M+ 26913
26914- icalBuddy    0.0  00:00.55 5/1   4    45+  110+  13M+   9680K+ 17M+   101M+  687M+  26913
26913  sh           0.0  00:00.00 1     0    17+  22+   332K+  840K+  856K+  17M+   2378M+ 26913
26865  SyncServer   0.0  00:00.17 4     3    49+  89+   8632K+ 9544K  14M+   94M+   2480M+ 26865
26719  ReportCrash  60.4 00:03.31 6/1   2    85+  165+  28M+   8108K+ 63M+   171M+  2572M+ 26719
26683  top          5.5  00:02.70 1/1   0    34   29    2116K  216K   2824K  17M    2378M  26683
26676  ocspd        0.0  00:00.01 1     0    25   23    568K   268K   1876K  17M    2378M  26676
25931  bash         0.0  00:00.01 1     0    20   23    360K   840K   1088K  17M    2378M  25931
25926  xterm        0.0  00:00.18 1     0    32   72    1300K  2804K  2748K  18M    2382M  327
25609  cookied      0.0  00:00.06 2     1    38   73    2712K  224K   3420K  96M    2457M  25609
21154  ssh          0.0  00:01.11 1     0    25   28    1060K  240K   2600K  18M    2378M  21154
12993  ssh-agent    0.0  00:00.16 3     1    45   85    1684K  280K   3280K  151M   2511M  12993
7736   mdworker     0.0  00:00.82 4     1    54   111   3812K  14M    9532K  165M   2548M  7736
1481   Console      0.0  00:30.47 3     2    121+ 342+  28M+   27M    146M+  246M+  2712M+ 1481
856    Image Captur 0.0  00:00.22 2     1    88   98    4188K  10M    10M    139M   2534M  856
855    AppleMobileD 0.0  00:00.40 3     1    49   100   11M    8972K  16M    106M   2484M  321
842    PTPCamera    0.0  00:00.32 4     1    91   112   4032K  10M    9444K  159M   2563M  842
769-   PluginProces 0.5  00:34.99 14    1    264  598   19M    23M    35M    191M   872M   325
741-   Microsoft AU 0.0  00:00.07 2     1    73   102   1500K  10M    3740K  162M   765M   741
704-   FNPLicensing 0.0  00:00.37 3     1    44   80    2460K  244K   3544K  118M   686M   704
677    Caffeine     0.0  00:00.14 2     1    80   123   2608K  11M    8608K  133M   2549M  677
676    GeekTool     1.7  01:06.85 10    7    156  180   6796K+ 19M    15M    176M   2584M  676
675-   ChronoSyncBa 0.0  00:01.34 3     1    84   130   1980K  12M    5604K  156M   766M   675
672-   AAM Updates  0.0  00:05.46 3     1    92   241   5648K  15M    11M    166M   811M   672
666-   SymSecondary 0.0  00:00.06 2     1    67   102   1484K  10M    3544K  132M   735M   666
665-   SAVDiskMount 0.0  00:00.04 2     1    29   60    708K   216K   1508K  74M    650M   665
664-   ScanNotifica 0.0  00:00.06 2     1    70   104   1404K  10M    3496K  139M   742M   664
662    taskgated    0.0  00:03.43 3     1    37   83    1912K  7648K  3776K  157M   2533M  662
656-   SymQuickMenu 0.0  00:00.14 3     1    86   166   2804K  12M    6784K  160M   766M   656
655    AirPort Base 0.0  00:00.01 3     1    37   70    968K   220K   2308K  98M    2467M  655
650    imagent      0.0  00:00.47 4     1    86   137   3840K  7756K  7336K  150M   2547M  650
645    warmd_agent  0.0  00:00.01 2     2    34   59    768K   220K   2020K  60M    2428M  645
624    bash         0.0  00:00.01 1     0    20   24    356K   840K   1088K  17M    2378M  624
621    AppleSpell   0.5  00:17.47 2     1    55   111   6192K  11M    13M    169M   2558M  621
603    quartz-wm    0.0  00:00.35 3     1    64   127   1936K  11M    6400K  153M   2548M  603
462    Xquartz      0.0  00:00.00 1     0    25   38    336K   220K   1592K  13M    2389M  462
461    xinit        0.0  00:00.00 1     0    21   35    272K   1004K  684K   9668K  2379M  402
402    sh           0.0  00:00.01 1     0    18   23    244K   836K   908K   9648K  2378M  402
401    xterm        0.0  00:00.50 1     0    32   73    1004K  2804K  2504K  9828K  2382M  327
397    aosnotifyd   0.0  00:00.42 3     1    54   314   5172K  8684K  10M    493M   19G    397
394    filecoordina 0.0  00:00.01 2     2    40   59    908K   216K   2128K  97M    2465M  394
381    hdiejectd    0.0  00:00.04 2     1    37   54    784K   248K   2064K  82M    2443M  381
372    diskimages-h 0.0  00:00.41 3     1    63   90    1892K  9540K  5964K  132M   2524M  372
370    WebProcess   0.0  00:47.53 5     1    139  1448  107M   33M    200M   341M   3872M  325
361    com.apple.do 0.0  00:00.16 2     1    95   138   4076K  12M    12M    158M   2562M  361
359    FileSyncAgen 0.0  00:05.27 11    3    141  182   12M    10M    21M    125M   2561M  359
356    fontd        0.2  00:12.28 3     2    91   218   5032K  8368K  7412K  136M   2552M  356
337    Finder       0.2  01:00.62 5     3    178- 434   25M-   39M    48M-   157M   2650M  337
336    SystemUIServ 0.1  01:04.66 3     1    335  307   17M    22M    31M    187M   2605M  336
335    talagent     0.0  00:00.24 2     1    93   113   3832K  10M    8824K  168M   2563M  335
334    Dock         0.0  00:09.68 3     1    217  1217  41M    29M    67M    87M    2629M  334
333-   AdobeAcrobat 0.2  00:34.33 25    3    167  451   17M    21M    55M    114M   928M   333
332-   Papers       0.0  00:04.37 11    1    174  562   32M    33M    51M    183M   863M   332
331    AppleScript  0.0  00:00.77 2     1    100  206   16M    29M    32M    148M   2597M  331
330-   Microsoft Wo 0.2  00:14.72 5     3    286  619   36M    65M    97M    350M   1215M  330
329    iCal         0.0  00:16.02 5     1    172  391   46M    28M    88M    177M   2666M  329
328    Mail         0.0  02:28.45 8     1    334  1107  89M    63M    174M   319M   3875M  328
327    X11.bin      0.7  00:11.93 7     1    128  370   12M    34M    36M    130M   2614M  327
326-   Aquamacs     0.3  00:20.21 2     1    92   294   18M    26M    32M    176M   852M   326
325    Safari       0.0  00:36.19 9     2    236  771   52M    74M    94M    198M   2733M  325
321    iTunes       0.7  01:14.70 17    2    442  650   112M   36M    158M   401M   3807M  321
320    pboard       0.0  00:00.00 1     0    27   43    536K   220K   1144K  20M    2380M  320
317    UserEventAge 0.0  00:00.46 3     1    224  178   5096K  9716K  10M    177M   2556M  317
279-   navx         53.3 59:20.71 2/1   1    31   187   259M   4476K  268M   395M   969M   122
276-   LiveUpdate   0.0  00:00.11 2     1    68   104   1600K  11M    4856K  90M    680M   122
272-   scheduledSca 0.0  00:00.02 3     1    44   74    824K   2360K  1812K  78M    649M   122
207    distnoted    2.0  02:10.97 15    14   153  117   5044K  240K   5740K  169M   2537M  207
205    mdworker     0.1  00:17.16 4     1    59   172   23M    11M    42M    167M   2563M  205
203    distnoted    0.0  00:04.15 5     4    44   94    1272K  240K   1968K  140M   2508M  203
201    launchd      0.0  00:04.97 2     0    354  110   1388K  564K   1976K  156M   2517M  201
198    launchd      0.0  00:00.01 2     0    53   51    524K   416K   968K   57M    2418M  198
168    coreaudiod   0.0  00:00.64 4     2    351  123   3892K  880K   5868K  163M   2527M  168
158    logind       0.0  00:00.01 2     1    34   54    812K   216K   1988K  87M    2447M  158
146    CVMServer    0.0  00:00.01 1     0    66   49    576K   252K   1260K  30M    2390M  146
145    WindowServer 1.3  01:50.65 19    1    445  1617  39M    150M   184M   184M   3447M  145
122-   NortonMissed 0.0  00:10.07 2     1    33   53    664K   216K   1444K  62M    630M   122
121-   SymAutoProte 0.1  00:35.46 8     1    247  193   246M   4500K  250M   388M   970M   121
106    racoon       0.0  00:00.06 3     1    38   63    924K   240K   2552K  91M    2452M  106
82     applepushser 0.0  00:02.57 3     1    60   84    3304K  7936K  7684K  161M   2538M  82
80     autofsd      0.0  00:00.02 2     2    37   60    928K   220K   2184K  90M    2458M  80
75     dynamic_page 0.0  00:00.02 1     0    24   24    236K   212K   812K   9648K  2378M  75
73     hidd         0.8  00:08.22 6     4    72   93    1612K  240K   2596K  139M   2508M  73
71     kdc          0.0  00:00.15 2     2    48   89    1508K  484K   3236K  128M   2497M  71
70     KernelEventA 0.0  00:00.03 3     1    35   56    640K   220K   1288K  65M    2426M  70
68     loginwindow  0.0  00:00.68 2     1    273  212   8972K  23M    19M    150M   2575M  68
66     mds          1.8  04:22.48 9/2   7    162  696+  299M+  21M    159M+  1177M+ 3654M+ 66
65     netbiosd     0.0  00:00.36 4     4    46   93    1964K  340K   3672K  127M   2496M  65
61     revisiond    0.0  00:00.04 4     2    39   71    1156K  216K   2576K  103M   2472M  61
59     stackshot    0.0  00:00.02 3     1    39   63    900K   220K   1608K  114M   2482M  59
58     rpc.statd    0.0  00:00.02 1     0    22   27    220K   216K   608K   49M    2410M  58
57     SystemStarte 0.0  00:00.03 2     1    37   68    864K   220K   1504K  113M   2481M  57
55     usbmuxd      0.0  00:00.97 3     1    54   98    1960K  1824K  4088K  146M   2508M  55
54     warmd        0.0  00:00.20 3     2    39   87    5508K  224K   6880K  153M   2521M  54
52     cron         0.0  00:00.01 1     0    24   32    368K   216K   964K   19M    2379M  52
51     ntpd         0.0  00:00.23 1     0    28   35    568K   220K   1560K  19M    2379M  51
49     awacsd       0.0  00:00.14 2     1    43   65    2196K  7936K  6644K  80M    2465M  49
34     securityd    0.0  00:03.29 4     1    103  84    6220K  7504K  7824K  159M   2536M  34
25     coreservices 0.0  00:07.73 4     1    377  446   6508K  18M    22M    155M   2558M  25
23     blued        0.0  00:00.58 3     1    118  75    3636K  7484K  5840K  120M   2497M  23
20     fseventsd    0.6  01:39.11 27/1  1    129  138   12M    216K   14M    1892M  4253M  20
19     distnoted    1.1  01:00.32 11    10   114- 99-   2424K- 236K   3080K- 166M-  2534M- 19
18     powerd       0.0  00:00.37 2     1    80   75    2320K  7416K  3340K  148M   2524M  18
17     syslogd      0.2  00:03.16 4     0    67   72    1604K  220K   1960K  165M   2526M  17

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