About a month ago I picked up two Richard Osterlind books. I got The Principles of Magic and The Principles of Mentalism. These books look like they’ve been out for a while, I think the magic one had a copyright date of 2005 and the mentalism one a few years newer.
These books are filled with short thoughts on different aspects of performing. Usually these little essays about about a page and a half to two pages. Richard gets the information across, but it’s a pretty much just the facts. He doesn’t go too deep into much of it, but it’s a starting point to get you thinking about different aspects of how you perform.
I’d say these books are targeted towards someone who is going from performing for family and friends to maybe trying to do a show, or just starting doing formal shows. If that’s you, pick up a copy of the one that’s appropriate to what you do.