I've been looking for a starting point for developing for my iPod Touch. AFAIK its a totally identical platform except for the phone and SMS elements of course - you can even run most iPhone applications on the iTouch including Maps which is awesome!
All I find when googling are a bunch of pages like that Wiki page you linked to, where there aren't any straight forward instructions, rather just a whole lot of wiki discussions from the multitude of people trying to get the toolchain working initially on their setups. Frustrating to say the least.
Now it would be great if you could do a 'part 2' covering the basics of GUI development. Given a lot of people will have no clue as to Macintosh style development at all. I come from a Windows API + Visual Basic + Visual C++ and lately the .NET environment, and this is totally foreign to me (Cocoa is a stupid name for a development kit!), it would be great to see some GUI basics, even if its only for the simplest of controls.