Good Place to learn Objective C?

I've decided that one of these days, I need to learn a programming language and get something accomplished. Now, I'm on OS X, which favors Objective C....I believe (correct me if I'm wrong), so that would be the logical jump. But since OS X is a unix breed, gcc and what have you are in full force, so any guide written for a unix compy should be fine.

 If someone has some OS X specific information (regarding cocoa and what have you) for total newbies, I'd pee myself with joy. However, if I can just get a command line program to make fun of me, I'll be happy.

Of course, if you've got a better idea (and I bet quite a few will) go ahead and chime in. Anyone?

If your brother turned into your sister... would it be okay to hit it?