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I'm soon going to be starting some iPhone Development (3.0) building a simple app that communicates with a web service and uses push notification.
My Objective-C is pretty much non-existent but I've already got some good information from this question and also from Apple's development centre.
Basically if you've developed with the iPhone before what caveats/hints/pitfalls/tips/etc could you recommened in general?
http://www.lynda.com/ is perfect for starting iOS, OSx development. The site takes you past the beginner status quickly.
Get "Cocoa Programming for Mac OS X by Aaron Hillegass" and go through the first half of the book. Get "Beginning iPhone Programming" after that and pay the $99 so you can run apps on your phone. There are a lot of design patterns in Objective C that are strange to begin with, but as you work more with them, they make sense.
One of the best things I found in the Hillegass book is his advice in the introduction: "assure yourself that you are not stupid and some things are hard".
I had great success getting started by diving into the Apple developer guides. I read the following:
Spend time looking over the various examples, read the code, make changes, etc. Apple also has many good examples (outside the books) that you can learn a great deal from.
I agree, Cocoa Programming for Mac OS X by Aaron Hillegass is a great book to learn Cocoa, and it covers Obejctive-c nicely, but if you really want to KNOW the language, I would recommend: Programming in Objective-C 2.0: http://www.amazon.com/Programming-Objective-C-2-0-Developers-Library/dp/0321566157
Both are fantastic books and nicely complement eachother.
Its very important to remember that other people are having a hard time learning Cocoa too. Reading Aaron's book is a fantastic way to start. Reading source code is also another great way. THere is some open source iPhone projects (for example: wordpress), and there a bunch for OS X. Read what other people are doing so you can get the flow of an application. I found that to be the hardest part about learning (especially the Cocoa part).