Ok, I just compiled PS on my AMD XP 2000+ (ATI Radeon 9000 Pro, using DRM / X -driver) box running 2.6.20-gentoo-r5 and it works quite well. There were some digest-issues first and I had to copy the art/ and data/ from the binary-installation to make it work but it runs smooth, I can see what I have in my inventory (icons were garbled using the binary-version) and the font is ok.
Works perfectly on my Core2Duo - Laptop (Graphics: i945GM, using DRM / X -driver), too.
Both systems have mesa 6.5.3 installed.