The problem in the picture isn't random. It looks like a memory or addressing failure or possibly something with MB to card communications.
Does it do it cold? Right after booting? Can you remember any possible link between ambient temp and problem severity?
Are you overclocking the card? If you have the software already, can you try underclocking both the GPU and VRAM clocks?
AGP? Disable fast transfer. Just for troubleshooting.
What motherboard? Latest BIOS?
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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