I used to think that all those "lifetime warranty" cards were just a gimmick because I mean, really, who uses their card for a "lifetime" or even a couple of years.
Well, I've been proven wrong and now I wish I had bought a "lifetime" warranty card.
I bought a Radeon X1900XT 512MB last year for $500 (March 2006) and it died just over a year later (June 2007) after the warranty had expired. The card weren't OC or anything, and this is the first time ever a graphic card had failed me before my intended upgrade. I had to hijacked the 7600GT from my HTPC to use it temporary until next-gen cards come out (hopefully soon).
So yeah, the next card I buy will definitely have a lifetime warranty or at least 2-3 years warranty since that will be my new upgrade cycle.