yeah mp3.com is probably the best one. It also has functions such as allowing your songs to be downloaded in multiple formats (MP3, and high and low bandwidth streaming Real Audio formats).
It also has useful thigns like page counter and stats on how mnay times your songs are downloaded. This can make it easy to see which of your material is the most popular with Joe Public (which often differs from the ones that you thought were your best!).
If you get a lot of hits and download MP£ will "recommend" you so that when people search for a style opf music it will have your link on there high up in the list.