What causes my screen to do this?

Lately my screen has been acting up (see linked picture) and forcing me to restart the computer (losing unsaved work) and then to only find the problem has re appeared in another colour when my computer has restarted. Can someone please offer some suggestions so I can resolve this annoying problem? Thanks in advance!
http://yfrog.com/16screenshot20100121at117p

Mainly Safari, Photoshop CS3, Microsoft Messenger, and maybe Preview and Quicktime. I think it starts with Safari, from memory, when I open the Top Sites page. I don't believe it has hit something but I could be mistaken.

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