What python book do you recommend?

In Why did you choose python as your primary programming language @sandeep asked

"I would like to learn Python too. Which book do you recommend".

Fair question. And there are many answers! There are a lof of python books out there. On the python wiki there are quite a few references but wouldn't it be best to share what books you have read?

Please share your advice below in the form of links to books, articles, etc and what specific audience it targets (beginner, skilled programmer, library-x-veteran) and most of all why you think it's a gem. Thanks!