O'Reilly releases official iPhone SDK app dev book
oreilly.com
oreilly.com
I grabbed these two products but haven't had the time to check them yet:
http://www.pragprog.com/titles/amiphd/iphone-sdk-development
http://www.pragprog.com/screencasts/v-bdiphone/writing-your-...
Could someone clear this up for me?
Since the NDA has been lifted to allow people to openly share iPhone development knowledge (only for APIs that have been released in public iPhone updates), that should allow everyone from book and magazine publishers to bloggers and tech conferences to share such information.
Aside from learning from $30-40 books: Building a calculator from scratch was recommended to me and is a great project that you can go from basic (accumulator) to nuts (Quartz rendering) on.