I'm sure you know about the issues with some NVIDIA mobile GPUs, as earlier in July NVIDIA admitted it was taking a $150 - $200 million charge to cover (emphasis mine):

... anticipated customer warranty, repair, return, replacement and other consequential costs and expenses arising from a weak die/packaging material set in certain versions of our previous generation MCP and GPU products used in notebook systems. All newly manufactured products and all products currently shipping in volume have a different and more robust material set.

Earlier this month NVIDIA gave laptop owners with NVIDIA GPUs headaches. The company filed a report with the SEC (.PDF) stating that the company was taking a $150 - $200 million charge to cover (emphasis mine):

"... anticipated customer warranty, repair, return, replacement and other consequential costs and expenses arising from a weak die/packaging material set in certain versions of our previous generation MCP and GPU products used in notebook systems."

Wait long enough and something new always comes along that's better than what you have. Sure, I have a Dell XPS M1730 with dual 8800M GTX cards in SLI - but along comes another announcement. On Wednesday at Computex in Taipei, NVIDIA introduced the GeForce 9M series of GPUs.