if you want to just post small examples of stuff, probably sound click is one of the most painless to setup and get going...
http://www.soundclick.com/bands/8/hollowcellmusic.htm
but if you want somewhere to post tracks with no adds and plenty of feedback from other producers, then electromancer....
http://www.electromancer.com/artist.php?id=e14f7ca834
sorry for giving you the links to my pages at these sites...they were in my favorites folder so they we easiest to copy and paste the links
