Something I am looking forward to delving into:
Simple and brilliant from Andrew Dubber’s New Music Strategies

Simplify Media actually manages to achieve what most music consumers have always wanted: a chance to connect to and enjoy each other’s music without the usual problems associated with that.

Simplify Media is a new plugin for iTunes on PC and Mac platforms (with later releases coming for Windows Media Player and WinAmp). It allows your friends to connect to your music library and listen wherever they are — and you can listen to their music collections too.