Rdio is a great service that gives you unlimited access to music from your computer and mobile phone. You can use the service even when you are offline. Rdio is still in private beta.
Venture Slogan: Your Music Everywhere.
Rdio’s own description: “…Unlimited access to music from your computer and mobile phone, even when you’re offline. With apps for iPhone, and BlackBerry phones, your music goes where you go — even if you’re offline. Discover music through people, not machines. Share the stuff you like on Twitter and Facebook…”
Venture Link: rdio.com