Checkout Appcelerator Titanium http://www.appcelerator.com/ ... I took a look at Phonegap first and for whatever reason overlooked Appcelerator...Phonegap is great but has a lot of limitations once you want to get beyond the basics.

Appcelerator's "kitchen sink" demo is an awesome demonstration of what you can do with it, and contains some great code to get started. https://github.com/appcelerator/KitchenSink