I just wanted to add that "Comodo Instant Malware Analysis" also lets you submit an exe for checking, but it goes even further than VirusTotal's scan: it actually runs the submitted exe and then reports all files created, changed and deleted; all Registry entries created, changed and deleted; and all processes created, stopped, and so on. You can then view the report online after a minute or so, and it's 100% free. It's found here:
http://camas.comodo.com/cgi-bin/submit
Great for testing new exes before you run them!


