Check it out www.lala.com
Basically its like cloud storage for your music. You sign up, upload your library, which lets you listen to it from any computer with a web browser. Then you can pay 10 cents to be able to stream new songs from their library, or you can buy them for 99 cents and download a drm free track. It works really well.
If you find yourself regularly using different computers, this is a great way to have all of your music, everywhere you go.
If you sign up using that link I'll get some free songs. Check it out if you think it sounds cool.
http://www.lala.com/emaillanding?templateName=SignUp&path=signup%3FinviteToken%3DY3JlZGl0cz01OmZyb209LTkyMjMyMDUxNzMwODAzMTQyODY6dG89bm9vcEBsYWxhLmNvbTo*-a7HiJMA0Ng4kd1_579ccfQ**&fc=viral.invite.memberLink