OK, so my book is out. At least, part of my book is available in Apple's iBook store. Check it out here.
Just some background, this is not the complete book. Rather, we had hoped to extract the chapter on Objective-C and release it as a stand-alone ebook. The idea was to have it out before WWDC, so I could promote it at the conference. That didn't happen, but that's OK. I'm excited to have it out now.
This is a thorough introduction to Objective-C, specifically taylored for iOS developers. It's not all inclusive, but at 58 pages, it does have a lot of bang for the buck (or three-bucks, ninty-nine cents--as the case may be).
If anyone's interested in the actual print edition, I'm still working on it. I'm in the middle of rewriting everything, updating it all to iOS 5.0. Which also means it cannot be released (and I cannot say much about the contents) until Apple releases us from our NDA. Still, the chapter that is in the print book has been rewritten, and there are a few significant differences between the two.
Think of it this way. If you need to support older devices (iOS 4 and earlier), then this e-book is for you. The print book will focus on iOS 5.0 and beyond. Let's be honest, you should probably buy both.
If you pick up a copy, let me know what you think.