Cool idea that actually uses the principle of cloud computing effectively. Analysis is done by the cloud, and no more updating required.
Result: light weight virus scanner without all that other junk: webblocker, scriptblocker, firewall, adware filter, network scanner, IM scanner, …
Just virus and rootkit protection is what I need. And preferably at a low system resource cost. And preferably for freez 
< currently in beta >
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Panda Anti virus is very very powerful to save your system.