Slow/Freeze after sleep and can't reboot?

I have a 24" iMac 3.06Mz with 4GB Ram. I'm currently running into some strange freezing issues with my imac where if the computer goes to sleep and I bring it back up, it will freeze/run REALLY slow (although not all the time, it has to be sleeping for a significant amount of time for this to happen). The big problem I'm having is that after this occurs, I have problems rebooting. As I reboot, it takes longer and longer to completely boot up (and when it does, it runs so slow it is unusable). It won't even boot into safe mode. I'm able to boot to the console (and windows XP) and both of those run fairly smoothly. I was going to try a wipe and reinstall but I have some applications I don't have backup copies of on the disk and attempting to create a disk image of the install is throwing I/O errors. If I let the computer sit for about an hour or so then it will reboot just fine. I tried resetting the PRAM and repairing the disk/permissions to no avail. There is nothing in the system.log to indicate a problem when the freeze occurs. I started noticing the issues on 10.6.3 (and am on 10.6.5 now) when the computer froze up playing starcraft. After that, it has happened to me only after wakes from sleep.

See:
Mac Maintenance Quick Assist,
Mac OS X speed FAQ,
Speeding up Macs,
Macintosh OS X Routine Maintenance
Essential Mac Maintenance: Get set up,
Essential Mac Maintenance: Rev up your routines,
Maintaining OS X, and
Myths of required versus not required maintenance for Mac OS X for starters.
BTW, reinstalling the OS only puts down new copies of OS components and basic Apple apps, such as TextEdit, Mail, and Safari, leaving everything else in place. The nuke and reinstall isn't needed.

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