Complete albums and no annoying slow connections, no disconnections in the middle...
let's see, today in 20 minutes of paging through the boards I got a 2 CD Current 93 live album, Robert Henke - Floating Point, Joe Meek And The Blue Men - I Hear A New World, Beatles - White Album, Black Texicans cowboy music from the 30s, Explorer Series - African Drums'n'Drones, Serge Gainsbourg - L'homme a tete de chou
Your tastes may differ, but there are like 100 different mp3 newsgroups to sample :) !