One of the cool things out there for independent musicians is iLike. It's a website that recommends free music by independent artists, by analyzing who your favorite artists are. It knows who your favorite artists are by keeping track of who you listen to in iTunes and your iPod, so you don't even have to tell it your favorites.
All you have to do is go to the site and download a plugin that attaches to iTunes. Then as you play songs in iTunes, a sidebar appears in iTunes that shows you other similar artists with free music you can download. It's really snazzy.
My song Together has been on GarageBand long enough that I'm now recognized as an artist on iLike. So that means that more users will find my music in iTunes, and I'll hopefully get more fans over time.
But in order for that to work, I need people I know to sign up with iLike and "like" me. So once you have it hooked up to iTunes, go to my artist page and click the "iLike this artist" badge in the upper right. You can also recommend the song itself. Also, apparently if you click this link, you'll automatically be my friend, but that's for my user page, not my artist page.
It looks like it also hooked me up to a facebook page. Funny.