I've got a two 8800 series cards (one 8800GT, one 8800GTS), and I live in a place with no air conditioning. If these cards were subject to heat failure the way the Inquirer has been hollering about - one or both would have died by now. Particularly the one in my wife's computer - it's a Shuttle box, which runs toasty. It's been rock solid, running 24/7 for more than a year now.
I'm not suggesting there is NO problem - but the Inquirer has been talking about this like all of these cards are just waiting to die. With no A/C, and temps in the house above 90F during the summer, they should be dead if the Inq is to be believed. Perhaps I'm just lucky, but I still aint buying the story.