Apps+That+Work+With+a+Projector

Apps that work with a projector
 * Apple
 * Keynote
 * YouTube
 * Videos
 * Safari ... video out on web pages
 * Penultimate
 * Netflix
 * UZU
 * forScore
 * iDemoWeb

Of course, with the iPad 2 now all apps can be shown on an external video device like a projector or monitor.