A German site called 3DWin has posted the latest detonators for download. I checked the NVDIA website but all they had were the 21.81 release.
Detonator XP software provides a 30-to-50% increase in performance for all NVIDIA GPUs in both DirectX and OpenGL Application Programming Interfaces (API). In addition, Detonator XP software exposes new hardware acceleration for Windows XP, enabling new features such as 3D textures and shadow buffers.
Let us know if these are better than the 21.81 release :) enjoy!