1) LimeWire can't identify protected content because the network is fully decentralized. If LimeWire could identify that kind of content, it would either filter it or it would already have been sued. It's the user's responsibility not to offer copyrighted content and not to download copyrighted content. Unfortunately for the copyright-owners there are a lot of irresponsible users out there, - including me.

2) Why stop at a virus scanner? Why not also include an Office Suite, a fully equipped audio/video/image viewer, CD burning software and a java based web browser/email suite? An instant messanger would be nice, too...