http://www.purplenova.com
their little software can selectively and securely host music straight off your home computer... and people can hear streaming audio through a URL...
so, say a musician needs a "certain someone" to hear a demo playlist.
* musician creates playlist through software
* software creates hyperlink/URL for playlist
* musician emails hyperlink to mister "certain someone"
* "certain someone" simply clicks on the link to hear the audio.
like all good software, it's lightweight and free
check it out and post what you think...
p.s. my buddy even managed to stream stuff on his blackberry