I've been uploading much of my music to Bandcamp, to see how well it works, as it offers a few very handy features for precisely zero money (for the time being anyway).
Firstly, the lossless uploads are automatically converted to a veritable plethora of download formats, such as three grades of mp3 (including two VBR), two grades of AAC, Ogg, FLAC and Apple Lossless.
Secondly, it gives me some useful stats as to what's been listened to, what's been skipped, and where people have come from to listen. There's also plenty of widget-sharing options, as expected on today's internets, enabling you to plaster my tunes all over the superhighweb.
Looks like you can also sell downloads there as well, offering either fixed price or donation options for the tracks, but I've yet to explore this option. Might give this a go once I get some more releases up there.