I'm Steffen Itterheim, author of the upcoming (Nov 24th) Learn SpriteBuilder book.
Turns out I haven't had enough of writing about SpriteBuilder and Cocos2D: I started updating the SpriteBuilder & Cocos2D Developer Guide which just went live with new and overhauled articles (refresh browser/clean cache if you don't see it instantly). The Cocos2D class reference will also get updates and corrections.
If you find anything in the guide or reference that doesn't make any sentence, or is in correct, or ... basically everything that you like to see improved upon, added to, corrected, spelled out in plain english: please leave a comment on this thread to let me know and +1 what others have posted so I get an idea what part I should work on next.
Thanks and I hope you'll enjoy the updates.