I've taken the liberty of combining together a number of different submissions we've received. First off, Network Magic recently came out with a new version of their software (tour on link). It's Windows-based primarily, but having tested it out on Mac/Linux/Windows-mixed network, it's worth checking out. Another individual pointed out that SourceForge Enterprise is now a 15 seat free download; you can also grab the ISO in Torrent form. (SourceForge is made by the other arm of the company that owns Slashdot, VA Software). Lastly, a couple of folks seem to have rediscovered the joy of Audioscrobbler and sharing the stuff via last.fm. Fun stuff.