IPhone :: Comparison between Corona, Phonegap, Titanium

I am a web developer and I want to move my web products to iPhone. One of the products is like Google Maps: show map on the phone screen, you can drag or resize the map and view some information that we add to the map.

I know there are some technologies that enables you to use HTML, CSS and Javascript to develop native iPhone apps. I've identified a few:

Ansca Mobile
PhoneGap
Appcelerator

Are there other, similar products? What are the differences between them? Which should I choose?

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