Macbook Pro boot issues

Today my Macbook Pro (about a year old) started acting very strangely. I got the spinning beachball and the whole thing froze up. I rebooted it, and I got the little folder with the question mark. Okay... Anyway, rebooted it and selected the appropriate drive (the only one) and it got me through the login screen, but then froze there. I rebooted again and started up in safe mode. That worked okay, and I backed up my important files and ran Yasu. Rebooted it again, and it started up okay, I figured I was out of the woods but after using the computer for a little while the same thing happened again—spinning beach ball, and had to reboot. Got the folder with the flashing question mark again. Tried to do the boot into safe mode again, but got the question mark again. Tried the boot select, and it just hanged. Put in my Snow Leopard disc and tried to boot from it, but to no avail: I got the "You need to restart your computer" message.
The next step was to reset the PRAM, and that seems to have worked, for now—I'm working on my laptop. However, I'm worried that this is all a sign of some problem with the computer. Should I be concerned? It's covered by AppleCare, and I was thinking of taking it in to the shop to get them to look at it. But, I can't really afford to be without my computer for too too long.
I thought I'd see what you kind folk thought. I need this computer for work. I have an old Macbook I can use in a pinch, but I originally replaced it with the Pro because it wasn't always reliable.

Hi Marek,
I do keep my system updated. Actually, now that you mention it, the last crash came after I finished installing all the updates through System Update. I did repair the permissions before I took it in to the shop the first time.
I booted in Safe Mode and opened up the error log. There are MANY errors coming up, so much that I can't post them all—this first set is just this morning, in the span of about five minutes. The second (below the ====) are from last night. There are too many to post from the same second, most of which are linked to sender "google.Chrome[158]" and give a message along the lines of "Bartleby.local Google Chrome Helper [253] <Error>: unknown error code: invalid context." Sometimes "invalid context" is changed to "invalid drawable" or "invalid numerical value"—just all kinds of invalid things. There are also a couple from Mail about "error getting audio property: 560947818."
My guess is that I should uninstall Chrome? I suppose it couldn't hurt. I would like to know why it is causing problems, though.
At any rate, here first is the error log from this morning (no crash yet; in safe mode) followed by a sample from just before the crash last night.
1-09-10 10:36:11 AM    com.apple.launchd[1]    *** launchd[1] has started up. ***
11-09-10 10:38:02 AM    com.apple.fontd[69]     FODBCheck: foRec->annexNumber != kInvalidAnnexNumber (0)
11-09-10 10:38:04 AM    com.apple.WindowServer[73]      Sat Sep 10 10:38:04 Bartleby.local WindowServer[73] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
11-09-10 10:38:05 AM    com.apple.fontd[69]     FODBCheck: foRec->annexNumber != kInvalidAnnexNumber (0)
11-09-10 10:38:11 AM    com.apple.launchd.peruser.502[89]       (com.apple.ReportCrash) Falling back to default Mach exception handler. Could not find: com.apple.ReportCrash.Self
11-09-10 10:38:12 AM    com.apple.launchctl.Aqua[91]    launchctl: Dubious ownership on file (skipping): /Users/david/Library/LaunchAgents/Safari_Teflon_By_SW.plist
11-09-10 10:38:15 AM    SystemUIServer[94]      Can't open input server /Users/david/Library/InputManagers/Edit in WriteRoom
11-09-10 10:38:16 AM    fontd[99]       Database content version mismatch (stored(15) != expected(14))
11-09-10 10:38:21 AM    com.apple.launchd.peruser.502[89]       (com.apple.Kerberos.renew.plist[107]) Exited with exit code: 1
11-09-10 10:38:21 AM    AirPort Base Station Agent[109] Can't open input server /Users/david/Library/InputManagers/Edit in WriteRoom
11-09-10 10:38:24 AM    Finder[95]      Can't open input server /Users/david/Library/InputManagers/Edit in WriteRoom
11-09-10 10:38:29 AM    SystemUIServer[94]      Could not load menu extra NSBundle </System/Library/CoreServices/Menu Extras/Volume.menu> (not yet loaded)
11-09-10 10:38:57 AM    Console[116]    Can't open input server /Users/david/Library/InputManagers/Edit in WriteRoom
11-09-10 10:39:14 AM    com.apple.coreservicesd[45]     ThrottleProcessIO: throttling disk i/o
11-09-10 10:39:15 AM    com.apple.coreservicesd[45]     ThrottleProcessIO: throttling disk i/o
11-09-10 10:39:38 AM    [0x0-0xd00d].com.google.Chrome[124]     [0910/103938:INFO:breakpad_mac.mm(89)] Breakpad disabled
11-09-10 10:39:43 AM    Google Chrome[124]      invalid pixel format
11-09-10 10:39:43 AM    Google Chrome[124]      invalid context
11-09-10 10:39:43 AM    Google Chrome[124]      Can't open input server /Users/david/Library/InputManagers/Edit in WriteRoom
11-09-10 10:40:02 AM    Safari[147]     Can't open input server /Users/david/Library/InputManagers/Edit in WriteRoom
11-09-10 10:40:07 AM    Safari[147]     Evernote Safari Clipper Plugin at your service!
11-09-10 10:40:24 AM    WebKitPluginHost[150]   Can't open input server /Users/david/Library/InputManagers/Edit in WriteRoom
11-09-10 10:40:24 AM    com.apple.WebKit.PluginAgent[149]       2011-09-10 10:40:24.348 WebKitPluginHost[150:903] Can't open input server /Users/david/Library/InputManagers/Edit in WriteRoom
11-09-10 10:40:27 AM    WebKitPluginHost[150]   -[FP_FPCAOpenGLLayer setBuffer:]: unrecognized selector sent to instance 0x189ef0
11-09-10 10:40:27 AM    WebKitPluginHost[150]   -[FP_FPCAOpenGLLayer setBuffer:]: unrecognized selector sent to instance 0x189ef0
11-09-10 10:40:27 AM    com.apple.WebKit.PluginAgent[149]       Sat Sep 10 10:40:27 Bartleby.local WebKitPluginHost[150] <Error>: unknown error code: invalid context
11-09-10 10:40:27 AM    com.apple.WebKit.PluginAgent[149]       Sat Sep 10 10:40:27 Bartleby.local WebKitPluginHost[150] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
11-09-10 10:40:27 AM    com.apple.WebKit.PluginAgent[149]       Sat Sep 10 10:40:27 Bartleby.local WebKitPluginHost[150] <Error>: unknown error code: invalid context
11-09-10 10:40:27 AM    com.apple.WebKit.PluginAgent[149]       2011-09-10 10:40:27.450 WebKitPluginHost[150:903] -[FP_FPCAOpenGLLayer setBuffer:]: unrecognized selector sent to instance 0x189ef0
11-09-10 10:40:27 AM    com.apple.WebKit.PluginAgent[149]       2011-09-10 10:40:27.451 WebKitPluginHost[150:903] -[FP_FPCAOpenGLLayer setBuffer:]: unrecognized selector sent to instance 0x189ef0
11-09-10 10:41:21 AM    com.apple.launchd.peruser.502[89]       ([0x0-0x19019].com.apple.Safari[147]) Exited: Terminated
11-09-10 10:41:21 AM    UserNotificationCenter[155]     Can't open input server /Users/david/Library/InputManagers/Edit in WriteRoom
===
1-09-09 11:50:09 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:09 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid drawable
11-09-09 11:50:09 PM    [0x0-0xf00f].com.google.Chrome[158]     [253:263:1383795168856:ERROR:gl_context_cgl.cc(56)] Error attaching pbuffer to context.
11-09-09 11:50:09 PM    [0x0-0xf00f].com.google.Chrome[158]     [253:263:1383795628439:ERROR:gpu_scheduler.cc(160)] Context lost because MakeCurrent failed.
11-09-09 11:50:09 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:09 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid context
11-09-09 11:50:09 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:09 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid context
11-09-09 11:50:09 PM    [0x0-0xf00f].com.google.Chrome[158]     [253:263:1383838775596:ERROR:gl_context_cgl.cc(56)] Error attaching pbuffer to context.
11-09-09 11:50:09 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:09 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid context
11-09-09 11:50:09 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:09 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid context
11-09-09 11:50:09 PM    [0x0-0xf00f].com.google.Chrome[158]     [253:263:1383843234013:ERROR:gl_context_cgl.cc(56)] Error attaching pbuffer to context.
11-09-09 11:50:09 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:09 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid context
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:10 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid drawable
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     [253:263:1384103497753:ERROR:gl_context_cgl.cc(56)] Error attaching pbuffer to context.
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     [253:263:1384108728908:ERROR:gpu_scheduler.cc(160)] Context lost because MakeCurrent failed.
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:10 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid context
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     [253:263:1384118989998:ERROR:gl_context_cgl.cc(56)] Error attaching pbuffer to context.
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:10 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid context
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     [253:263:1384120681262:ERROR:gl_context_cgl.cc(56)] Error attaching pbuffer to context.
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:10 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid numerical value
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:10 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid drawable
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     [253:263:1384464810189:ERROR:gl_context_cgl.cc(56)] Error attaching pbuffer to context.
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     [253:263:1384466181493:ERROR:gpu_scheduler.cc(160)] Context lost because MakeCurrent failed.
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:10 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid context
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:10 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid context
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     [253:263:1384477279095:ERROR:gl_context_cgl.cc(56)] Error attaching pbuffer to context.
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:10 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid context
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:10 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid context
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     [253:263:1384480306676:ERROR:gl_context_cgl.cc(56)] Error attaching pbuffer to context.
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:10 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid context
11-09-09 11:50:10 PM    [0x0-0xf00f].com.google.Chrome[158]     Fri Sep  9 23:50:10 Bartleby.local Google Chrome Helper[253] <Error>: unknown error code: invalid numerical value

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