I got two technical books this Christmas dealing with Agile development: Craig Larman’s Agile and Iterative Development: A Manager’s Guide and Scott Ambler’s Agile Database Techniques. Although I haven’t sat down to read them cover-to-cover, I think that the subject material they cover is quite useful, especially if you are looking at getting into Agile software development, or would like to just know what it is.
One thing I noticed is that some of Ambler’s chapter content is much the same as his articles posted freely on his web site. So, if you’re hesitant to buy Ambler’s book, look through some of his vast collection of writings and see what he has to say for yourself.