I received my copy of Cocoa Programming for Mac OSX this week. I started reading it and have learnt alot already just from the first few pages. I am looking forward to learning Xcode, Interface Builder and more importantly developing for the iPhone. I figure that when I have learnt programming for OSX, I wont have too much trouble developing for the iPhone. Having developed Windows software in the past, I am not too concerned about learning a new platform, but am very excited!