System hangs, but mouse cursor is moving and music keeps on playing

Hi,
I'm experiencing very odd behaviour with my MacBook.
System hangs suddenly. I can't switch to any programs, but music keeps on playing and mouse cursor moving. It stays like this forever unless I force laptop to shutdown (by pressing the power button over 5 secs).
Few things that I've noticed when system crashed:
- I had a lot of programs running (Photoshop, Firefox, lots of small apps)
- I used Expose or alt-tab
- iTunes is playing music
Can anyone recommend some tests or tricks that I could run before sending it to the Apple service?

You might be right about having less apps to consume RAM. I've upgraded my RAM to 2GB because I knew this would be on issue.
Maybe I just have to start looking for better performance. Something that can house more RAM. 2xQuad Core Mac Pro for example
Poikkeus wrote:
- When this problem occurs again, go to the Apple Menu and activate Force Quit. Then, quit applications that may be hanging.
I tried to point out that mouse cursor is moving but system doesn't respond to any clicks.
I'll try the Main Menu and keep eye on RAM consumption. I'll post to this thread if it hangs again.

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