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.
It's easy to get confused as there are several outdated downloads and project pages floating around the web. It appears, however, that this github repository is where Mogenerator is being actively developed.
A few days ago I stumbled upon Swiz, which bills itself as the "brutally simple micro-architecture for Rich Internet Application development with Adobe Flex." If the term micro-architecture or the buzzword Rich Internet Application haven't scared you off yet, read on, because it really is a lovely little framework.
Cue the emergence of a viable alternative to Google App Engine.