The following works well for doing app demos for protoypes or pre-release apps:
- Take an “expendable” iTouch device with iOS4 on it
- Launch http://jailbreakme.com in Safari on the iTouch
- Install ScreenSplitr on iTouch from the Cydia app (http://cydia.saurik.com/)
- Install iDemo on your Mac or PC from http://www.plutinosoft.com/idemo $9.99
Makes an excellent tool for app demos to a room of people using a laptop projector or using gotomeeting for a remote demo.