How easy to get started on making apps for Mac?

Question

I've done some delving into AppleScript but I'm interested in how difficult and long it would take to make semi-useful Mac apps.

What really good resources besides Apple Documentation?

Answer 1

"Cocoa Programming For Mac OS X" from Aaron Hillegass. Nice book that gives you an introduction into Objective C and Cocoa programming.

Answer 2

As stesch said "Cocoa Programming For Mac OS X" is the best book available for an introduction into Cocoa and Objective-C. However if you already know python or ruby you can easily make great looking applications using their cocoabindings.