I've mentioned Andromeda before. It streams music, some contributed by the artists.
http://www.turnstyle.com/andromeda/
Netmess appears to be in it's infancy...maybe something to look for in the future.
http://sourceforge.net/projects/nmclient/
This Plebio thing is supposed to be a search engine for stuff on your hard drive. Sounds lame to me.
http://plebio.com/