Where did you get the idea?

Here's a comic from XKCD that got me thinking about the idea of VirusZoo.
(click to see a see a bigger version from the original site)

How does it work?

A virtual machine under VMWare is running on a different machine from the web server. Once a virus is triggered through VirusZoo, the file is executed on the virtual machine.

The virtual machine is wiped clean to a stable state every night, or every time it crashed or become unresponsive due to virus activity.