All bands and musicians should check out Tunecore.com

"People think it's too good to be true, well it's not, it's true and it's good!" --Roger O'Donnell, keyboardist for The Cure

"TuneCore is a music delivery and distribution service that gets artists' original music (even cover versions) and record label releases up for sale on iTunes, eMusic, Rhapsody, Sony Connect, MusicNet and Napster without asking for your rights or taking any money from the sale or use of your music."

"Anyone can now have their music distributed; just like Frank Black, or, for that matter, any other artist. There's no need for record companies anymore." --Ken Goes, Manager, The Pixies, Frank Black

You might also wanna check out Cruxy.com

"Cruxy creators are actively uploading, promoting, and selling their original music, films, and more. (...) Cruxy offers a portable, skinnable player for presenting your media on any blog, profile, or site."

They also have a player that works within SecondLife. You can hand out or sell players to other avatars inworld or people can pay for a direct mp3-download via the cruxy-site.

Here's an example for the player (thank you for the music, friends! I didn't customize the player yet. It's only a test, ok?):