Panda Cloud Antivirus (free)

CNET Download has a good description of the just released free...

Panda Cloud Antivirus (Panda product site)

...beta release product at...

Panda introduces cloud-based free antivirus (CNET)

The CNET article says that Panda Cloud Antivirus uses 50MB of drive space and 17MB of RAM. It also reports that the antivirus functions when not connected to the Internet by accessing its local cache.

I'm still pretty happy with the Free Avast Antivirus (for personal use). But, I may give Panda's cloud product a try on Windows installed on a virtual machine guest OS.