This is a new set of leaked Detonator drivers. No release info was available but files are dated April 2nd, 2003 and include support for the new GeForceFX 5200, 5600 and 5800 boards. Additionally I've heard from a few forums these fix some of the AA bugs found in previous 4x.xx Detonators. BTW, Guru3d deserves a mention since they were the first to spot them.
Download Dets v.43.51 for Windows 2000/XP.