NoVirusThanks offers a free online detection service that analyzes suspicious and malicious files for viruses/worms, Trojans/backdoor and all kinds of Malware that are not only detected by antivirus engines including bots, rootkits, etc.
NoVirusThanks also publishes a blog on analysis of new or weird Malware.
We have provided a page for all out users to submit their suspicious files to NoVirusThanks, which can be found http://www.evilfingers.com/projects/NoVirusThanks.php
NOTE: This page is NOT intended for comparing AV's.
Let us know if you have any questions. Contact us at contact.fingers @ Gmail.com