thanks for finding SoundCloud. Hopefully plenty of people here will find it a useful tool for sending/receiving tracks without having to use yousendit, zshare, sendspace etc! They can be a real pain.
SoundCloud is still in public beta but due to launch later this year. For anyone wanting an invite to the site now though we've set up a guestlist for the Gearslutz forum with 20 invites. So be quick...
http://www.soundcloud.com/guestlist/gearslutz