This is the sort of groundbreaking application that I’d love to see us shipping by default in future. Most comfortable viewing of videocasts, easy searches on youtube or even your local drive. It tops iTunes by a large margin. Sadly the mac client is tons more polished than the Linux one.
You may know it under its former name, Democracy player. It has gotten a very nice face lift recently, including the app icon from John Hicks. Too bad the few tango icons are horribly broken. I smell Adobe Illustrator involved.