It seems NVidia's GeForce 8800 graphics card isn't just for gamers. According to this article a password recovery company has figured out a way to push some of the processing off to the 8800 and increase the speed of brute force cracks by a signifigant amount.

http://www.pcauthority.com.au/news.aspx?CIaNID=63950

A higher resolution on password cracking