I noticed over at nV News that nVidia has just released Detonator 40.72 WHQL certified drivers for Windows XP and 2000. The file weighs in at 12.3mb and strangely is dated 11 November 2002 - go figure. I haven't had a chance to test out these drivers yet, so use them at your own risk.
NVIDIA's Detonator™ graphics driver is the industry standard for the graphics software industry. Based on the NVIDIA unified driver architecture (UDA), the Detonator driver is both forward and backward compatible-across all implementations of NVIDIA graphics processing units (GPUs).More information @ nVidia