ATI has just posted the official 4.11 Catalyst drivers to their site:
These new drivers include a memory allocation bug fix for all AGP RADEON products with 256 of MB of memory, which significantly improves performance for applications that make intensive use of graphics memory.
Download: Download ATI Catalyst 4.11 With Control Center (Windows XP) *Requires .NET Framework
Download: Download ATI Catalyst 4.11 With Control Panel (Windows XP)