I've heard a few debates in the past over which is more mature: RubyCocoa or Obj-C/Cocoa... but I have felt that the answers jet right over the "newbie" that would truly appreciate an answer.
So the question is: for a total beginner, with little-to-no programming experience, is it easier to learn Ruby and explore Cocoa via the bridge (then possibly tackle Obj-C) or to straight up jump right into Objective-C and Cocoa.
Both communities are strong and have a plethora of resources, but as many people have pointed out the syntax of Obj-C is just daunting. Perhaps for a true beginner it would be easier to learn Ruby then tackle Objective-C?
Update: I apologize, but when I said "learn Ruby and explore Cocoa" I did not mean to learn programming via RubyCocoa, but rather to learn Ruby (and once one feels confident enough) begin to explore Cocoa with the possibility of leveraging their growing skill-set to tackle Obj-C.
I would not recommend learning to program with RubyCocoa.
I love Ruby and think it's a great language to learn programming, but the RubyCocoa bridge isn't documented well enough that I'd recommend it as a learning environment. You'd be learning general programming concepts, the Cocoa frameworks and the quirks of RubyCocoa all at the same time. That's a lot of stuff to shove into your head.
If you're bound and determined to start with Cocoa, start by learning Objective-C. Otherwise, you could learn Ruby to begin with and then transition to Objective-C once you feel a little more comfortable as a programmer. And once you've done all that, you can use RubyCocoa, but then you'll know enough that it won't make you go crazy.