Avast! Virus Cleaner is currently (in version 1.0.145) able to identify and remove the following worm families:
Win32_Swen [Wrm]
Win32_Badtrans [Wrm]
Win32_Blaster [Wrm] (aka Lovsan), variants A-F
Win32_BugBear [Wrm], including B variant
Win32_Ganda [Wrm]
Win32_Klez [Wrm], all variants (including variants of Win32_Elkern)
Win32_Nimda [Wrm]
Win32_Opas [Wrm] (aka Opasoft, Opaserv)
Win32_Sircam [Wrm]
Win32_Sobig [Wrm], including B, C, D, E and F variants
Win32_Yaha [Wrm] (aka Lentin)
Download:
Mirror 1:
http://www.avast.com/files/eng/aswclnr.exe
Mirror 2:
http://www.asw.cz/files/eng/aswclnr.exe