In contrast to many other of these posts, I think this one is important. Perhaps we should make a list of sites we know contain virusses.
Hmm... I can't think of any.
But we could make another similar list of places that might contain virusses. For example the sites that advertise with "you are our 1.000.000th visitor, congratulations" or "you got a new message" or similar things.
Also, ImageShack has been hacked not so long time ago, so it could contain virusses perhaps.