Is really sharing:

http://www.simplifymedia.com/index.html

Everyone needs to download this, it's amazing. It streams your entire music library (compatible with iTunes and Winamp) and allows you to share it with your friends remotely (via a friends list, max of 30 people). It's free on top of that.

* For those of us with iPhones, there's even an iPhone Application that allows you to stream any of the music libraries on your "Friends List" directly to your device without syncing, it costs $3.99

Anyone who gets this, feel free to add me. My name on it is "colorofsakura", without the quotes.