Demoing iPhone apps during presentations is a bitch because Apple hasn't (yet) given us a way to mirror the screen like Steve Jobs does during his keynotes. The alternatives all suck to various degrees: use a camcorder, an Elmo (the projector, not the Muppet), or the iPhone Simulator. The iPhone Simulator is the easiest option and is fine unless you're trying to demo features only found on the device (like GPS, etc.) or make a demo video of your app being used in the field.

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Update: This post is barely a week old and already outdates. See my updated post and The GAE SWF Project to get started quickly buildingFlash and Flex applications on Google App Engine.
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