Macbook freezing when more than one program runs

Hello all,
My Macbook is about a year and a half old. A few weeks ago, it crashed catastrophically, and the geniuses at my local store replaced the logic board.
Since getting it back, it's been crashing almost every time I try to run more than one program, such as itunes and safari. Ichat video or photobooth on their own cause it to freeze. The freezing process is gradual; first the program I'm looking at freezes, but I can navigate to other programs, but within a few minutes those freeze as well. During the freeze, the cursor moves (in beachball shape) but the screen is unresponsive and apple-option-escape has no effect; the only solution is to manually turn it off. It's also taking longer and longer to boot up. This happens when it's plugged in as well as on battery power. It's gotten to the point that I'm scared to do work on it, because I can't trust it to work long enough to save my data. What happened? Is this the result of my "fixed" logic board or something else? I am getting SO FRUSTRATED by how unreliable my macbook has become!!

To rule out any 3rd part apps/additions are causing the problem, try booting into Safe Mode...
http://docs.info.apple.com/article.html?artnum=107392
Have you replaced/changed Ram lately? ...if so, try reverting back to the old.
You could also ensure you've run your standard Maint. scripts (via Onyx, Cocktail etc...) and perhaps boot to the Install DVD to verify/repair the hard drive and its permissions. Booting to the Install DVD and running the Apple Hardware Test (hold 'D' on startup) could also reveal things.
Failing all that, try resetting the SMC and Pram...
http://docs.info.apple.com/article.html?artnum=303319
http://docs.info.apple.com/article.html?artnum=2238
To rule out a 'bad' hard drive you could either replace it physically or try booting from another Macbook via firewire...
http://docs.info.apple.com/article.html?artnum=58583
These are all a bunch of general procedures that the user can try to eliminate the issues - if nothing works, you'll need to make another trip to the genius bar.

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