Emergency Patch Download
Conficker Worm Patch MS08-067 (958644)
WinXP (SP2 or below)
Win2003 32-bit (SP1 or Below)
Other OSes can be found here: http://www.microsoft.com/technet/security/Bulletin/MS08-067.mspx
Further removal / detection info and tools here: http://iv.cs.uni-bonn.de/wg/cs/applications/containing-conficker/