Apple have a pretty good guide that describes Objective C (sorry, don't have the name of the doc at hand, but it's about 300 pages long, if memory serves you ri

Apple have a pretty good guide that describes Objective C (sorry, don't have the name of the doc at hand, but it's about 300 pages long, if memory serves you right - it's in the "getting started" part of Apple Developers Connection... But if you just want to get right in and start programming, do what everyone else does, and get your hands on the Hillegass book 'Cocoa Programming for Mac'. Yes, I know, you want to program the iPhone, not a Mac, but this will teach you the idioms of Cocoa programming, as well as give you a good introduction to the tools (XCode, Interface Builder etc) After that... well, there are some books coming out specifically for iPhone programming, but the word from the Cocoa Developer's list seems to be that most people are able to get along just fine with the Apple reference documentation (which is excellent, by the way), provided they already know Cocoa. I've started programming my iPhone, having started programming the Mac about 18 months ago, and it's been a fairly smooth transition, even without having a book to hold my hand.