I'm terrified of public speaking and so, in an effort to find a way of reducing this fear, I've read A LOT of books on the topic. Confessions of A Public Speaker is definitely one of the better ones.
It's less of a 'how to' and more of a description of the author's experiences (positive and negative) with some hints, tips and guidance thrown in.
I really liked this format. I found it interesting and a refreshing change from the 'feel the fear and do it anyway' approach taken by quite a few of the books in this genre. The chatty, informal and humorous style in which it's written makes it an extremely easy and engaging read, and I thought that the photos which show venues from a the view of the speaker were a nice touch.
Definitely worth a look if public speaking's something you struggle with.