soulseek is an awesome mp3 download program.
it's not as fast or as widespread as kazaa (you don't download a file from multiple users) but it is easier for downloading whole albums at once (right click, download folder)
usually, most of the people who use this know what they're doing with mp3s, as oppose to aol kiddies on kazaa who rename files and leave incorrect tags
http://www.slsk.org/