Any recommended books on agile methodologies?

N2IT

I'm in the market for a study guide / reference guide. Not really geared towards a certification just agile in general. I've been reading (The Business Analyst's Handbook) which covers ITIL, RUP (IBM Engineering Process Framework), Microsoft's agile processes, and the BABOK. Obviously way to much there, but the book incorporates well. However this books hits on Waterfall and other methodologies. I am looking for something specific to Agile. Most development efforts I have been associated with only use agile.

the_Grinch

I concur, I would love anyone's suggestions on this!