Just saw this @ Nvnews.net.

I'm not sure how long this link is going to last, but it has what appear to be an ATI authored Powerpoint slide presentation on the R300. Here are some of the highlights: R300

350 MHz. clock
400+ MHz. memory clock
8 Pipelines
150 Million Tri/sec (peak)
Increase Multitexturing to 8 textures
Improved Pixel/Vertex Shaders
DX9 Support
MPEG 1/2/4 Encode/Decode For More Info and the ATi R300 Powerpoint Presentation warp2 Nvnews