This is a great book. It provides descriptions, why to use and how to use guides for over 170 free windows devlopment tools. Scott Hanselman provides the foreward.
It has its own website.
I can definately see myself plugging several of the tools myself.
For example I have used, but forgotten about SourceMonitor. This allows analysis of an entire codebase to allow detection of excessively long methods, overlyly complex methods, uncommented code.