Groovefish will allow the most excellent Grooveshark music streaming service to be used on a Windows Mobile 6.x device.

Changes:

Music player should be less buggy now.
Crash on exit should be fixed.
Music player now give more information when connecting to a stream.
More debugging information (will help the developer in debugging).
Two options added; Pause on headset disconnect and Pause on incoming call.

http://forum.xda-developers.com/showthread.php?t=561374