suprnova.org is great although geared toward bigger files
(Make sure you go to .org, NOT .com or .net!)
I had a problem with shareaza on my system, it kept locking up. I've been using ABC (Another Bittorrent Client) with much better results.
If you have decent binaries newsgroup service on your ISP there is a free program called GrabIt that will check a group, let you know which files are complete then download and assemble them for you.