Asus has released a ton of bios updates:
Bios P4S533 with Onb. LAN 1007 Final (=1007 - 03 Beta)Download
Bios P4S533 without Onb. LAN 1007 Final (=1007 - 03 Beta)
Bios P4B266-M 1004 - 02 Final (=1004 - 02 Beta)
Bios P4B 1010 Beta Final (=1010 - 02 Beta)
Bios P4B266 / P6B266-SE 1007 - 02 Beta
Bios P4B266-C 1004 - 02 Beta
Bios P4B-LX 1006 - 03 Beta
Bios P4T-E 1006 - 03 Beta
Bios P4T-EM 1003 - 03 Beta
Bios P4S133 1008 - 02 Beta
Bios P4S133-VM 1005 - 02 Beta
Bios P4S333 1007 - 01 Beta
Bios P4S333-M 1006 - 04 Beta
Bios P4S333-FX 1006 - 04 Beta
Bios P4S333-VM 1006 - 05 Beta
Bios P4S333-VF 1006 - 05 Beta
Bios P4S533 1008 - 01 Beta
Bios TR-DLS / -DL 1006 - 04 Beta
Bios TR-DLSR 1012 - 05 Beta
Bios CUR-DLS / -DLSR 1012 - 05 Beta
Bios TUSL2- / CUSL2 - Series ( i815e ) 1012 - 08 Beta
Bios TUSL2-C / CUSL2-C ( i815ep ) 1012 - 08 Beta
Bios TUEP2-M / CUEP2-M ( i815ep ) 1012 - 08 Beta
Bios TUEG-VM ( i815eg ) 1012 - 08 Beta
Bios A7V333 1007 - 04 Beta
Bios A7M266-D 1006 - 002-D Beta
Bios P5A - Series 1011 - 05 Beta