I got mid-way through the second edition but then upgraded to 10.5 and Xcode 3 and found myself having trouble with the differences between the newer tools and the book. The prospect of the third edition gets me excited to take another crack at things as it felt like I was finally making some progress moving from Applescripting into "real" programming. The thing I enjoyed most was that I was able to jump into real-functioning example programs almost right away. It's a shame the demo app stopped building properly for me under Xcode 3.