The version 1.4 update to the ATI R500 (X1000 series) programming guide expands coverage on texture memory layouts, notes on anti-aliasing for lines/polygons/points, and some additional GPU registers were added in too. The announcement regarding this update can be found on the ATI driver mailing list while the NDA-free guide can be found on the X.Org server, but it's no light reading if you're just an end-user.
Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.