They integrated ClamAV into it though I haven't tried it yet.
The interface is pretty different but I haven't done much with it.
It did install on Vista SP1 just fine and seems to be working OK.
Running the integrated AV on a few workstations already. Has a low processor/memory footprint and performs much better than our current solution (CA eTrust...bleh). Not bad for being a free, integrated AV solution.