Just been trying out the unite service from Opera. Allows you to use your own computer to stream music and share files directly from your own computer securely without having to upload to a website. It's cool!

It's free and part of the latest Opera web browser.

http://unite.opera.com//

I believe Opera are the guys who caused Microsoft all those headaches in the European courts over bundling Internet Explorer with Windows, so you are either gonna love 'em or hate 'em. :)