This has everything I want in a music site. It's just about perfect. Tags, so albums are well-classified and easy to find more of; preview or full play on an in-browser player (including the ability to play all the albums on a page of search results -- instant radio); downloads via BitTorrent in either MP3 or Ogg Vorbis; comments; search by license/restrictions; a huge variety of RSS feeds to keep up with new music... And best of all, more than half of the dozen or so albums I listened to were worth actually having. After five minutes I'm in love.
"...the home for language courses developed by the Foreign Service Institute. These courses were developed by the United States government and are in the public domain."