I'm in the process of learning Cocoa/Objective-C and I'm writing
some stuff for the iPhone as an exercise.
I am sure you are about to get a bunch of comments about the
appropriateness of posting iPhone related questions on this list, but
I will leave it to a moderator to do it properly. I will say that
using an unreleased beta product to be your first foray into Cocoa/
Objective-C is probably not the best approach. It might make more
sense to use a stable, released environment with plenty of books on
the topic and some good resources for asking questions (like this
list, which *is* appropriate for general Cocoa questions).