I want to learn how to use core-animation for the iPhone in a more serious manner; instead of just ripping other people's code to move a box a few pixels, I want to be able to write that code myself, and engage in translation, transformation, and other things with an understanding of the code I'm using to achieve it.
Unfortunately, the online documentation is, at best, rather dense. And while I have a good book for general iPhone programming, coreAnimation is a very large, complex area and it doesn't cover it in any real depth. Are there any good books that cover the subject?