I wrote a book on WordPress called Smashing WordPress: Beyond the Blog. If you want to learn how to do funky stuff with WordPress, this is the place to start – but then again I might be a bit biased on the subject. Still, it is a pretty cool book in full color and everything. Read more about it on my TDH.me blog.
Smashing WordPress: Beyond the Blog is a must have for anyone wanting to do cool things with the Core theme since a lot of the examples in the book is built on, or using code from, it. You might want to check it out.
Incidentally, I’m writing a second WordPress book as well. Read more about that on my Facebook fan page.