This is great! I sometimes imagine writing an intro-to-Cocoa book (just idle daydreaming), and the target audience that strikes the most terror into my heart is the absolute beginner. Offhand I think you're taking a good approach to this, and you're one of the best-qualified people to make it work.

Best of luck. This *may* even inspire me to actually use my Twitter account.

I'd like to say I'll send you feedback, but I always fall short when I make promises like that, and then I feel crummy. So let's just say I'll send you feedback -- if I get around to it.