Developer website: Code Sorcery Workshop
Pop Rock takes the Ironcoder theme of Retro and the API of Core Animation and combines them as a retro rock concert app launcher. As each app is launched, it is a featured performer on stage, playing a guitar riff in front of the rest of your running apps. The more apps you are running at the time, the more popular the launched app and the better the crowd reaction.
Mac OS X 10.4 or later, sense of humor.