A massive display of the 20,000 or so most popular iPhone apps on the iTunes App Store at WWDC '09. Whenever an app is bought, it's icon pops up and down. See the "About" highlights for a more in-depth description of the exhibit. Pictures were taken on an iPhone so quality isn't that great, but the pictures synthed incredibly well.
*Note the closeup on iSynth. In one photo it's popping up because somebody downloaded it!
If you weren't linked from it, check out the TechCrunch article about this synth at http://www.techcrunch.com/2009/06/11/apples-awesome-app-wall-gets-photosynthed/