Horizontal lines and Artifacts in Snow Leopard

Has anyone seen colored lines/ artifacts? They just started appearing since I upgraded to Snow Leopard. They are usually horizontal with colored pixels inside. They are appearing inside windows and palettes more and more. They disappear if I adjust the width of the window but not if I move it's position.
Example below.
Thanks.
Craig
screen-shot-2009-12-04-at-6.01.16-pm-3.jpg

I'm having these issues, and even as I type this message the title bar of my browser window displays the glitch.
A quick web search suggests issues with graphics cards. I never had the issue until I upgraded to Snow Leopard, and part of me believes the problem resides in the OS.
The screen artifacts get even wilder in Photoshop, with large blocks of glitchy pixels and sometimes I see chunks of other images I had worked on in the recent past.
Will post back if I solve the problem.

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