A review by alexture
Software Technical Writing: A Guidebook by James Gallagher

informative inspiring fast-paced
An excellent introduction guide that was extremely useful to me.

Note that this isn't really a book, though: James compiled all his blog posts about technical writing into one document. Given this format, there are sometimes redundancies, regular occurrences of "see you tomorrow for another post!", and the structure is not always very clear. (Since it's published under a free license, I might just take the time to reorganise it a bit, some day, for a Second Edition. It would be a good exercise, too!)

A highly recommended read.