@ElDiablo
I suspect if it were a graphics card issue, that I would see lines across the screenregardless of what window etc. This issue never happened with Tiger either, regardless of much harder operating circumstances/temperatures.
I'm going to go through with Giaguara's recommendations...
My 15inch MBP[W8626], purchased in July of 06, seems to be giving me major problems.
I'm getting really odd graphics artifacts all the time. It can be as simple as a multicolor line in a window, on the desktop or through an icon. Othertimes its as major as an icon or section of a graphic...