SOUNDS - Discover music with friends
SoundNode - SoundCloud desktop app (OS X, Windows, Linux)
Wohooo.net - Create Your Own Online Radio Station
Cumulus - A SoundCloud player that lives in your menubar.
Listen2MyRadio - Stop dreaming, start streaming. Free and premium Shoutcast and Icecast audio broadcasting.
Sleeve - Your currently playing track displayed right on your desktop