At nVidia's latest press conference, there was a presentation shown about ATI's X800 launch, and as expected nVidia seemed to find it fun to bash its competitor ATI. Among the accusations towards ATi in the slides are:

the X800 XT is an act of desperation
the X800 is based on old hardware and software
ATi don't know how to implement 3.0 shader support
ATi have mislead the public regarding their products clock speeds
ATi have 'suspicious' drivers

See the whole presentation for yourself: at VolariGamers

and EliteBastards have a reply from PR front man Derek Perez.