Hey TX.
Myspace is pretty trashy; I've got some of my stuff there, but I'll probably be taking it down in the next few weeks.
I have the best luck with EZ Folk and iSound. I have a hard time navigating iClick and Download.com, but I've also got stuff there, too. You might also look into Folk Alley (it says folk, but this year the web site did highlights on Guy Davis, Rory Block, and Harry Manx. I don't get as many hits on Folk Alley as I do EZ Folk and iSound, but FA is easy to navigate.
If you're surfin' at work, make sure you've got some time; sometimes you can watch the progress bar for ten minutes while you upload your mp3's and your photos, and then the whole process kacks and you have to start over... gotta have your files named correctly and your file sizes have to be just so.
Have fun. Let me know when you've posted your music.
Mike