I actually haven't got any viruses off LimeWire, and I've been using it for ages. Like unlovedwarrior said, you just have to guess if something is right or not. I follow these practices:
• Don't download anything with unusual names
• Only download things that I'm looking for
• Only download something if it falls in the correct size grouping (i.e. a < 1MB file isn't gonna be good for your computer..)
• Don't download anything with 60+ uploads (I find that it isn't even a download, it usually links to a site. But sometimes it's a virus)
But really, if you're safe, there's little chance of stuffing up your computer through LimeWire.
BTW, this thread was started in 2004. Why was it picked up again?