Resetting PRAM and SMC does not resolve crashes; what next?

Lion has been crashing (when going to sleep, when waking from hibernation, when closing Safari's last tab, when shutting down, among other, less common, scenarios) very often on my MacBook2,1.
What is the sequence of steps you would try to resolve, or at least debug, the problem? I have already reset the PRAM and the SMC. Imperically, the rate of crashes may have already lessened, but it still happens. What to try next?

Here is the last gory message. I did nothing more perverse than boot the laptop, launch emacs to read a text file for a minute, exit emacs, then shutdown. It didn't. It crashed instead. This is the crash log when I rebooted.
Oh, and I was in the car. So I wasn't connected to anything of any sort.
Interval Since Last Panic Report: 67141 sec
Panics Since Last Report:          2
Anonymous UUID:                    485C4G17-4827-8C3D-ABG8-3748E38473AD
Fri Jan 6 20:39:06 2012
panic(cpu 0 caller 0x2cdabf): Kernel trap at 0x0029ab52, type 14=page fault, registers:
CR0: 0x8001003b, CR2: 0x00000010, CR3: 0x00100000, CR4: 0x00000660
EAX: 0x00000010, EBX: 0x02a21000, ECX: 0x06484000, EDX: 0x02e3268c
CR2: 0x00000010, EBP: 0x487833a8, ESI: 0x00865b90, EDI: 0x00045a3a
EFL: 0x00010202, EIP: 0x0029ab52, CS: 0x00000008, DS: 0x00000010
Error code: 0x00000000
Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x487831f8 : 0x22032e (0x6ad86c 0x48783218 0x229f00 0x0)
0x48783228 : 0x2cdabf (0x6b9c3c 0x29ab52 0xe 0x6b9be5)
0x487832d8 : 0x2e3e34 (0x48783300 0x487832e8 0x487832f8 0xa871298e)
0x487832f8 : 0x29ab52 (0xe 0x48 0xa8060010 0x10)
0x487833a8 : 0x29ace2 (0x865b90 0x1 0x487833c8 0x3b8907c)
0x487833c8 : 0x29b248 (0x865b90 0x1 0x48783438 0x2b3de3)
0x487839f8 : 0x29bbe0 (0x390e2d8 0x1 0x48783a18 0x2b66a9)
0x48783a38 : 0x26ac38 (0x7fda1c8 0x48783bc8 0xf 0x8)
0x48783cd8 : 0x26afac (0x7fda1c8 0x0 0x0 0x5af000)
0x48783d28 : 0x591fc3 (0x7e175b0 0x0 0x0 0x5af000)
0x48783d68 : 0x30b127 (0x804f7b4 0x0 0x0 0x5aefc0)
0x48783db8 : 0x30adaf (0x804f774 0x40 0x6370bd0 0x804f720)
0x48783df8 : 0x30c633 (0x1 0x0 0x48783e18 0x3282f3)
0x48783e48 : 0x31b534 (0x637ec50 0x0 0x1b 0x229fd2)
0x48783e88 : 0x30a1b7 (0x637ec50 0x80000 0x0 0x6059508)
0x48783ea8 : 0x5706b8 (0x6510c20 0x0 0x0 0x48783ef0)
0x48783f08 : 0x57d4c6 (0x1 0x8 0x48783f2c 0x5529bc)
0x48783f78 : 0x5f15fa (0x6510c20 0x6396994 0x605944c 0x0)
0x48783fc8 : 0x2e4977 (0x6396990 0x0 0x10 0x6396990)
BSD process name corresponding to current thread: launchd
Mac OS version:
11C74
Kernel version:
Darwin Kernel Version 11.2.0: Tue Aug 9 20:56:15 PDT 2011; root:xnu-1699.24.8~1/RELEASE_I386
Kernel UUID: C3837DE7-E387-2847-9B2E-DF39284A91C2
System model name: MacBook2,1 (Mac-F4208CAA)
System uptime in nanoseconds: 217579598224
last loaded kext at 56011615575: com.apple.filesystems.cddafs          2.5.0 (addr 0x133f000, size 24576)
last unloaded kext at 128748143994: com.apple.driver.USBCameraFirmwareLoader          1.1.0 (addr 0xd1f000, size 24576)
loaded kexts:
com.apple.filesystems.cddafs          2.5.0
com.apple.filesystems.msdosfs          1.7.1
com.apple.driver.AudioAUUC          1.59
com.apple.driver.AppleHDA          2.1.3f7
com.apple.driver.AppleUpstreamUserClient          3.5.9
com.apple.driver.AppleMCCSControl          1.0.26
com.apple.driver.AppleBacklight          170.1.9
com.apple.driver.AppleIntelGMA950          7.0.0
com.apple.driver.AppleIntelIntegratedFramebuffer          7.0.0
com.apple.driver.SMCMotionSensor          3.0.1d2
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AudioIPCDriver          1.2.1
com.apple.driver.AirPort.Atheros21          430.14.9
com.apple.driver.ACPI_SMC_PlatformPlugin          4.7.5d4
com.apple.driver.AppleLPC          1.5.3
com.apple.filesystems.autofs          3.0
com.apple.driver.AppleIRController          312
com.apple.driver.AppleUSBTrackpad          225.2
com.apple.driver.AppleUSBTCKeyEventDriver          225.2
com.apple.driver.AppleUSBTCKeyboard          225.2
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          33
com.apple.iokit.SCSITaskUserClient          3.0.1
com.apple.iokit.IOAHCIBlockStorage          2.0.1
com.apple.driver.AppleEFINVRAM          1.5.0
com.apple.driver.AppleFWOHCI          4.8.9
com.apple.driver.AppleUSBHub          4.5.0
com.apple.driver.AppleRTC          1.4
com.apple.driver.AppleIntelPIIXATA          2.5.1
com.apple.driver.AppleHPET          1.6
com.apple.driver.AppleUSBEHCI          4.5.0
com.apple.driver.AppleUSBUHCI          4.4.5
com.apple.iokit.AppleYukon2          3.2.2b1
com.apple.driver.AppleAHCIPort          2.2.0
com.apple.driver.AppleSmartBatteryManager          161.0.0
com.apple.driver.AppleACPIButtons          1.4
com.apple.driver.AppleSMBIOS          1.7
com.apple.driver.AppleACPIEC          1.4
com.apple.driver.AppleAPIC          1.5
com.apple.driver.AppleIntelCPUPowerManagementClient          167.0.0
com.apple.nke.applicationfirewall          3.2.30
com.apple.security.quarantine          1
com.apple.driver.AppleIntelCPUPowerManagement          167.0.0
com.apple.driver.AppleAVBAudio          1.0.0d11
com.apple.driver.DspFuncLib          2.1.3f7
com.apple.driver.AppleBacklightExpert          1.0.3
com.apple.iokit.IOFireWireIP          2.2.4
com.apple.iokit.IOSurface          80.0
com.apple.iokit.IOBluetoothSerialManager          4.0.1f4
com.apple.iokit.IOSerialFamily          10.0.5
com.apple.iokit.IOAVBFamily          1.0.0d22
com.apple.iokit.IOEthernetAVBController          1.0.0d5
com.apple.iokit.IOAudioFamily          1.8.3fc11
com.apple.kext.OSvKernDSPLib          1.3
com.apple.driver.AppleHDAController          2.1.3f7
com.apple.iokit.IOHDAFamily          2.1.3f7
com.apple.driver.ApplePolicyControl          3.0.16
com.apple.driver.AppleGraphicsControl          3.0.16
com.apple.iokit.IO80211Family          411.1
com.apple.driver.AppleSMC          3.1.1d8
com.apple.driver.IOPlatformPluginFamily          4.7.5d4
com.apple.iokit.IONDRVSupport          2.3.2
com.apple.iokit.IOGraphicsFamily          2.3.2
com.apple.kext.triggers          1.0
com.apple.driver.CSRUSBBluetoothHCIController          4.0.1f4
com.apple.driver.AppleUSBBluetoothHCIController          4.0.1f4
com.apple.iokit.IOBluetoothFamily          4.0.1f4
com.apple.driver.AppleUSBMergeNub          4.5.3
com.apple.iokit.IOUSBHIDDriver          4.4.5
com.apple.driver.AppleUSBComposite          3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.0.1
com.apple.iokit.IOBDStorageFamily          1.6
com.apple.iokit.IODVDStorageFamily          1.7
com.apple.iokit.IOCDStorageFamily          1.7
com.apple.driver.XsanFilter          403
com.apple.iokit.IOATAPIProtocolTransport          3.0.0
com.apple.iokit.IOSCSIArchitectureModelFamily          3.0.1
com.apple.iokit.IOFireWireFamily          4.4.5
com.apple.iokit.IOUSBUserClient          4.5.3
com.apple.iokit.IOATAFamily          2.5.1
com.apple.iokit.IOUSBFamily          4.5.3
com.apple.iokit.IONetworkingFamily          2.0
com.apple.driver.AppleEFIRuntime          1.5.0
com.apple.iokit.IOAHCIFamily          2.0.7
com.apple.iokit.IOHIDFamily          1.7.1
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          165.3
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.DiskImages          331
com.apple.iokit.IOStorageFamily          1.7
com.apple.driver.AppleKeyStore          28.18
com.apple.driver.AppleACPIPlatform          1.4
com.apple.iokit.IOPCIFamily          2.6.7
com.apple.iokit.IOACPIFamily          1.4

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Computer really noisy (fan I think?). Resetting PRAM and SMC does not work.

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so basically, as the title says, my computer is making a really loud noise as soon as I turn it on, I am presuming it is the fan.
Over a month ago, my computer started to constantly crash, and about two weeks ago I took it to a Genius Bar for a diagnosis. The problem was a hard drive failure, so I had it replaced and yesterday I brought it back home.
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My initial problem of a loud fan, after a hard drive replacement, was fixed, so I do not hear it anymore, but this wind-like noise is different. With the iMacs, I presume the fans are towards the top, which was where the loud fan noise came from, however, this wind-like noise seems to come from the bottom of the computer screen are, centre and right side (in the direction I face it), but not the left side.
I describe it as wind-like, but it sounds a bit like when the computer is on heavy demand and the computer loads, yet different as it is quieter and slightly different in pattern, and unlike the usual heavy demand noise which comes from the top, it comes from the bottom.
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