Update: PhoneGap CAN be used to develop for the iPad, if the information in the following article from O'Reilly Radar is true!
Web developers can rule the iPad
Information from the PhoneGap website:
Comment: Why does the video give me the impression that development is still a boy's club? It looks like no women were involved in the PhoneGap code camp. This is 2010, not 1985, and I'd expect to see more young women involved in this sort of development.