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There's a lot of threads for application suggestions. Just search up the forums and you'll find them easily.

The link GGJstudios posted above has a good chunk of them.
 
I would recommend Alfred. Cool little assistant program.

Also things like VLC for media and TextWrangler if you're into programming.
 
I have an Apple Developer Account and would like to start programming for the iPhone but don't really know where to start.
 
What exactly is Xcode? I have a book on how to make apps for the iPhone but I don't see Xcode mentioned anywhere.
 
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