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Big thanks to everyone who came out to the iPhone / mobile application development birds of a feather session at cf.Objective. HUGE thanks to Lawrence at Apress, and Betsy at O'reilly who bent over backwards to get us material to give away at our session. As promised, here's a list of some of the resources that Dan, Josh, and myself came up with. Please feel free to add your resources in the comments.

Resources / Tutorials
Stanford University's iPhone course: http://www.stanford.edu/class/cs193p/cgi-bin/index.php
iPhone Dev Central: http://www.iphonedevcentral.org/
Learn Objective-C: http://www.cocoadevcentral.com/d/learn_objectivec/
Apple Developer Connection: http://developer.apple.com/

Books
Beginning iPhone Development: http://apress.com/book/view/1430216263

Publishing & App Store Success
Stanford University: http://www.stanford.edu/class/cs193p/downloads/Section-2-PublishingApps.pdf

Software / Tools
PhoneGap: http://phonegap.com/
Morfik: http://www.morfik.com/
VixML: http://vixml.com/

Update - 06/03/09 - Added 43 iPhone Development Resources found over on The Apple Blog.