I have a friend who has developed several iOS apps and he said the Stanford tutorials are extremely good and give great tips some of which he had unfortunately learned the hard way. I have not seen them myself yet.
If you are familiar with basic object oriented language concepts and basically any programming language (Javascript, for example if you are a web developer), then I think the book would work for you. As an HTML/CSS person, you are already accustomed to using objects, like XML/JSON DOMs. Perhaps the only additional concept to learn is memory management.
I just checked the intro of the book, it suggests that if you don't know C or Obj-C, then the book "Objective-C Programming: The Big Nerd Ranch Guide" would help you get started.
