Here's a mind map of the "History of XP/Agile Books."

I picked up five BOI's; Addison-Wesley XP series, Agile Project Management Signature series, Pragmatic Bookshelf, Microsoft Professional, Prentice Hall, and Japan. In the XP-Fiesta I printed this mind map in a very large piece of paper and posted on the wall, and vote "which book do you like best" by dot stickers. Dave Thomas and Andy Hunt's "Pragmatic Programmers" got the most points, and Ruby books were popular.

A PDF of the mind map is here;
http://wiki.esm.co.jp/HistoryOfXPAgileBooksbyKenjiHIRANABE.pdf
(this inlcudes Japanese fonts... I'm not sure if its readable in your computers)

The above mind map is drawn by JUDE/Think!

Download
[JUDE/Think! 1.1.2 (for Windows)] 26,259KB
http://jude.change-vision.com/jude-web/files/jude-think-1_1_2-jre-setup.exe

[JUDE/Think! 1.1.2 (for MacOSX)] 9,875KB
http://jude.change-vision.com/jude-web/files/jude-think-1.1.2-MacOs.zip