I'm part of some online MP3's pools so to say. They are mostly promotional companies trying to push new artists and it's sadly not always good music, but its always free. There are also thousands of blogs full of mp3's online. There is a smaller group of blogs that stick to strictly 320kbps MP3's and/or FLAC. I tend to frequent those most often. In fact, I'm an admin on a particularly large
Hip Hop blog that is strictly 320 and FLAC. It's basically like a pool. It's a collective of bloggers sharing as many albums and singles as they can.
Technics SL DZ-1200 Digital Turntables
M-Audio Connectiv with Traktor Scratch Pro
And a ton of other stuff too
Mad Beat FactoryDigital1200