Online antivirus

Bitdefender

http://www.bitdefender.com/

Computer Associates

http://www3.ca.com/securityadvisor/virusinfo/scan.aspx

F-Secure

http://www.f-secure.com/

Trend Micro(Housecall)

http://housecall.trendmicro.com/

Symantec

http://security.symantec.com/

Pandasecurity

http://www.pandasecurity.com/homeusers/solutions/activescan/

Free ESET Online Antivirus

http://www.eset.com/onlinescan/