MacBook Pro constantly locks up, any ideas?

My MacBook Pro will lock up for no apparent reason at any time, either while in an application or just moving around within the desktop/dock.  I've tried reinstalling the OS (Snow Leopard) per the recommendations of the local Genius Bar and that seemed to work for a few days but it's doing it again.  Anyone experience this or know of a fix?

/Library/Preferences - trash the finder plist file.
Disconnect all peripherals from your computer. Boot from your install disc & run Repair Disk from the utility menu. To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
Select your language.
Once on the desktop, select Utility in the menu bar.
Select Disk Utility.
Select the disk or volume in the list of disks and volumes, and then click First Aid.
Click Repair Disk.
Restart your computer when done.
Repair permissions after you reach the desktop-http://docs.info.apple.com/article.html?artnum=25751 empty the trash and restart your computer.
I've tried reinstalling the OS (Snow Leopard)
Please correct your system information as you confirmed you are still using "Mac OS X (10.4.10)"

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