Loved it. Though at first I thought it would hook up to rdio api rather than go throughout dumping library onto a central Mac. On another note I like these screen casts, keep em coming.
Pull Requests welcome for Last.fm/Spotify/rdio. :) Doing a centralized server was the easiest way to avoid the whole "I have a rare song on my desktop that I really want to play and now I'm mad I can't play it on the speakers."
"As you can see here there's also a download link, so if you legally obtained this music and have full rights to this music, you can download a copy straight from the browser to your machine."
Unfortunately, with the current state of online music store terms of services, it is unlikely that this is the case for the majority of music in most people's collections.
c.f. also non-work-related internet use in general, bathroom breaks, staring out the window and thinking, and other productivity-killing pursuits on "company time" ;)