I published my first book recently it's primarily aimed at performers who want to put on a show at the fringe festival. However those that aren't performers also appear to be enjoying it.
Book is available in paperback, and two other formats I wouldn't recommend trying to read in the bath (Kindle and eReader).
Full book details plus loads more free information about running shows at the fringe here
Reviews so far have been quite positive "wonderfully illuminating and extremely funny" - Festival Previews