VirusTotal
You might have seen VirusTotal in the American edition of PC World Magazine s 100 Best Products of 2007. For those of you that didn't, Virus Total will scan the file you uploaded with 33 different virus scanners updated every few hours including AVG, avast! and McAfee. VirusTotal has no upload limit, but don't be surprised when a 200mb file takes half an hour to upload.
Jotti's Malware Scan
Jotti's Malware Scan is similar to VirusTotal, but it only has 20 virus scanners. But because of this Jotti's Malware Scan will be a little faster. However, the Malware Scan only accepts files less than 10 mb.
VirSCAN
This multi-engine scanner has three more scanners than VirusTotal, but it seems to take twice as long as VirusTotal and Jotti's Malware Scan. Not only that but it only has a 10mb upload limit. One feature that might be useful to some users is the ability to see how harmful or harmless an infected file may be (I personally get rid of an infected file if I see one).
That concludes this article, but remember that none of these scanners replaces a good antivirus client that is actually installed on your system. You can get some good free ones pretty easily here and here.
