After creating a profile you upload your favorites (New Kids On The Block, Smashmouth, Boyzone, Enya etc) and arrange them into something listenable (promise not to judge you).
Here's something I slaved over a little while ago.
How long will this site last? Only baby Jesus knows.
Someone from 8tracks just left a comment:
Many thanks for the coverage!
We're licensed (unlike Muxtape and Playlist.com) under the US compulsory license for webcasting (the thing that governs internet radio, and under which which Pandora, Live365, Last.fm etc operate).
Scoop on the legal stuff here: http://8tracks.com/legal.