Macbook Pro just stuck ("hang") sometimes

Greetings.
I have following problem that pursuit me for around 1 year now and actually it might have always been there:
Macbook Pro just "stuck" sometimes and require me to restart the application as its not responding. "Send report to apple" appears right when i force quit from a program and it says "hang".
Usually it happens in games (like World of Warcraft — its possibly the most hardware demanding game i use), but sometimes also happens in iTunes, Safari (if i open like 20-30 tabs that might have "heavy" flash ads) etc. It used to happen quite rare but now it seems to happen every 2nd day and its quite annoying.
- At first i thought that the problem might lay in my HDD and so i replaced it (wanted bigger one anyway) in authorized apple SC. I also re-installed everything from scratch and "manually" moved documents to my new HDD.
- Then i thought that it might be my ram since i upgraded from 2Gb to 3Gb (1+2 Both Hynix). AHD and Rember didnt show any errors.
- Then i thought that it might be overheating. Even though i have climate control in my office (26-27C i believe), i bought Zalman-NC1000 external notebook cooler.
Nothing of those helped.
So i am wondering what else can i do to stop this annoying "hangs"?
My macbook pro is identified by system as: MacBookPro3.1, c2d 2.4, has 8600GTm video, 3gb ram and 500gb WD hard drive.
Message was edited by: Olexiy.p

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

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