I registered to this site just so I can post my results in baking my defective 8800GT. Little over half a year ago my card went toast (lines, artifacts, bsod, bad quality picture, overheating, could not run games etc.). It went on for a while and suddenly one time got so bad I couldn't even start the computer anymore. After checking the warranty (that went VOID just 2 weeks before incident) I was so pissed that just biked to the nearest electronics store and bought a 9800 card (I didn't have too much extra cash).
But yesterday I had a conversation with my friend and we talked about this baking method and I thought I'd give it a try (I had nothing to lose anyway) but decided to document it well so I could be helpful/provide good overview over the method.
And quess what, it actually worked! I'm using the one time defective card right now! I shall post some pictures and two videos of what I did. (Basically it's the same thing the OP did except that I filmed a boot before putting the card in the oven so EVERY sceptic person can get it in their face)