In a follow-up to Saturday's retro tunage post, I've discovered that the formerly defunct Audio Paragon has resurrected as Pure Obscure. Looks like I've already missed a few good tracks as well. QFD.
Another MP3 site that I thought I'd re-mention is the Deep House Archives, which has several CD-length techno/house/jazz mixes available for download. Recommended mix: "Meltin' Pot", mixed by Steve Z.