The program is Songbird. A new open source program combining the revolutionary browser Firefox and one of the greatest music players to date, iTunes.
The program is still in beta and uses a lot of memory (100mb), but one might expect this from an app with web browsing and music playing capabilities.
Its got a long way to go, but if you'd like to check it out, you can find it at:
http://www.songbirdnest.com/
-Demon