F M's List: Online Anti-virus Scanners

Jotti's malware scan is a free online scan service, utilizing various anti-virus programs to diagnose single files.

virusscan.jotti.org/ - Preview

antivirus malware virus scan spyware anti-virus online on 2008-04-30 and saved by 240 people

Top notch online anti-virus scanner, quite nice uptime and performance

www.virustotal.com - Preview

antivirus scan security scanner online on 2008-04-30 and saved by 259 people