What programming language to learn?

[myopic1]

I am interested in learning how to write simple apps for the iPhone. What programming language would it be best to learn?

I figured Cocoa, but I don't want to waste a lot of time, if that isn't the right direction.

Thanks!

[AliensAreFuzzy]

You will need to learn Objective-C, which is the language of Cocoa.

[myopic1]

I'm thinking about getting this book:

http://www.amazon.com/Cocoa-Programming-Mac-OS-3rd/dp/0321503619/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1215461795&sr=8-1

Does this seem like a good place to start? Can you recommend a good Objective-C book?