Seems Apple has stepped up to the plate and has offered extensions to it's warranties where the failure is to a Nvidia GPU:
Apple Support![]()
Have a look at the link if you think that your Macbook is affected. It's models made from May, 2007 to September 2008. Full details contained in the link.
This will be welcome news to many Macbook owners who have been concerned about what happens when it fails outwith warranty.
Looks like a lot of people still have these laptops and screamed loud enough that Apple pushed nvidia to extend their extension. My 2.5GHz MBP seems to be fine 

