I know some of you play an instrument or even write music.  I really miss when I had more time to play and create music.  I've seen technologies come and go for working on music with other people over the Internet, but don't think any of them really worked well enough to still be around.  Do you know of any tools that make the process of working on songs and individual tracks 'asynchronously' doable over the Internet?  Or better, real-time?  Please chime in if you're a musician who'd be interested in trying to put something together this way!  Back in the early 90's I belonged to a group that exchanged tapes over snail mail, but had a hard time finding anything similar for the modern age (but I haven't looked very hard either!).

Some older attempts like NinJam and Rocket Networks didn't seem to make it very far.  I spent some more time looking into this topic and found one that seems current: http://www.ejamming.com/highlights/39/