10.6.7 update has slowed my 2010 MBP drastically. Help!

I recently updated my 2010 MBP, 2.4 GHz, 4GB RAM to 10.6.7 and since I installed the update the performance has dropped massively. Upon booting it takes 7 minutes from when the deskptop appears for the finder and the dock to become available. The only piece of advice I could find on this was to repair permissions which I've done twice to no avail.
Any ideas? Do I need to reinstall OS X from the CD or can I revert back to 10.6.6 some way? Will I need to back-up my hardrive first?
Cheers!

William,
I booted in safe mode and got a 7.5 minute delay from when the login screen apeared until I was able to type in my password. As with the normal start-up (I am the only user therefore there is normally no login screen) I could move the mouse pointer but not click on anything.
The console utility read-outs are as follows:
07/06/2011 16:49:32    [0x0-0xf00f].org.mozilla.firefox[141]    NOTE: child process received `Goodbye', closing down
07/06/2011 16:49:32    com.apple.launchd.peruser.501[87]    ([0x0-0x1a01a].com.apple.Console[277]) Exited: Killed
07/06/2011 16:49:32    com.apple.launchd.peruser.501[87]    (com.apple.AirPortBaseStationAgent[124]) Exited: Killed
07/06/2011 16:50:10    com.apple.launchd[1]    *** launchd[1] has started up. ***
07/06/2011 16:51:20    com.apple.DumpPanic[30]   2011-06-07 16:51:20.269 DumpPanic[30:107] Error getting a reference to IODeviceTree:/options
07/06/2011 16:51:20    com.apple.launchd[1]    (com.apple.DumpPanic[30]) Exited with exit code: 1
07/06/2011 16:51:33    com.apple.launchd[1]    (com.apple.xprotectupdater[13]) Exited with exit code: 255
07/06/2011 16:52:20    com.apple.coreservicesd[45]    2011-06-07 16:52:20.408 lsregister[75:903] _CFGetHostUUIDString: unable to determine UUID for host. Error: 35
07/06/2011 16:52:23    com.apple.fontd[67]    FODBCheck: foRec->annexNumber != kInvalidAnnexNumber (0)
07/06/2011 16:52:24    com.apple.fontd[67]    FODBCheck: foRec->annexNumber != kInvalidAnnexNumber (0)
07/06/2011 16:52:48    com.apple.coreservicesd[45]    ThrottleProcessIO: throttling disk i/o
07/06/2011 16:53:20    com.apple.WindowServer[73]    Tue Jun 7 16:53:20 Iain-Irvines-MacBook-Pro.local WindowServer[73] <Error>: kCGErrorFailure: Set a breakpoint @ CGErrorBreakpoint() to catch errors as they are logged.
07/06/2011 16:53:29    com.apple.launchd[1]    (com.apple.fontd[92]) Job appears to have crashed: Segmentation fault
07/06/2011 16:53:29    com.apple.launchd[1]    (com.apple.fontd) Throttling respawn: Will start in 8 seconds
07/06/2011 16:53:29    com.apple.ReportCrash.Root[94]    2011-06-07 16:53:29.526 ReportCrash[94:1407] Saved crash report for fontd[92] version ??? (???) to /Library/Logs/DiagnosticReports/fontd_2011-06-07-165329_localhost.crash
07/06/2011 17:02:22    com.apple.launchd.peruser.501[100]    (com.apple.ReportCrash) Falling back to default Mach exception handler. Could not find: com.apple.ReportCrash.Self
07/06/2011 17:02:27    fontd[111]    Database content version mismatch (stored(15) != expected(14))
07/06/2011 17:02:30    com.apple.launchd.peruser.501[100]    (com.apple.Kerberos.renew.plist[119]) Exited with exit code: 1
07/06/2011 17:02:39    SystemUIServer[105]    Could not load menu extra NSBundle </System/Library/CoreServices/Menu Extras/Volume.menu> (not yet loaded)
07/06/2011 17:02:45    com.apple.coreservicesd[45]    ThrottleProcessIO: throttling disk i/o
The problem seems to come in after about 1.10 where the "dumppanic" line is. Any ideas what's wrong?

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