Found this article on El Reg:
http://www.theregister.co.uk/2004/09/13/grouper_p2p_launc/
Currently only works with XP and 2000, it uses WMP9 and .NET. They say there will be a version for other OSes soon.
Unfortunately, it appears to use the Grouper servers as a central distribution system for the group keys, which means it presents a legal target for the RIAA etc.
Link:
http://www.grouper.com/
http://www.theregister.co.uk/2004/09/13/grouper_p2p_launc/
Currently only works with XP and 2000, it uses WMP9 and .NET. They say there will be a version for other OSes soon.
Unfortunately, it appears to use the Grouper servers as a central distribution system for the group keys, which means it presents a legal target for the RIAA etc.
Link:
http://www.grouper.com/