nVidia has released for public access the slides presented during GDC 2007, which cover among other things: rendering tips and tricks, Direct3D 10 topics, and a preview of the features included in the long awaited FX Composer 2.
The slides are available in PDF files and can be found here.
By the way, for those that heard some rumors about FX Composer 2 coming out next month, the slides are clear, and I quote: