In the Massive Genre of Electronica, how the hell do you guys classify all the different types? Trance, Progressive Trance, D'n'B, Ambient, etc.... Is there a site anywhere's that lists all the "types" and how you would classify something?

Also, what are some of the better sites to find tunes from up-and-coming DJs or get review and Top-40 type lists of the popular "main-stream" (if you want to call it that) DJs??? I have a fair bit of stuff myself, but I'm always looking for new stuff, and there's sooo much out there. Where's a guy to start?

Any help would be greatly appreciated!

Styler_007