Some recent book purchases:

Balancing Agility and Discipline: A Guide for the Perplexed [Paperback]
This looked interesting because I believe that good Agile teams actually need to be fairly diciplined. I do not view Agile as not having diciplne. What real-world trade-offs exist? This book is useful with both its "Day in the Life" and case studies. (Plus, any book with forwards by Booch and Cockburn is probably useful.)

A Guide to the CMM: Understanding the Capability Maturity Model for Software [Spiral-bound]
All of the CMM books I've read up until now (well, mostly browsed) seem so thick with jargon. These people come from a different planet than me. This one has drawings. I like drawings.

Organizational Patterns of Agile Software Development [Paperback]
This is a book version of James O. Coplien's pattern website. It has a little more info in it as well, but this is a time that it ends up being easier to read paper and think about things than it was with a monitor.