Here's another, just finished:

• American Government in Black and White, Paula D. McClain and Steven C. Tauber, Paradigm Publishers.

And finally have time to update.

• Power in Numbers: UNITAID, Innovative Financing, and the Quest for Massive Good, Philippe Douste-Blazy and Daniel Altman, with a preface by Bill Clinton, PublicAffairs Press
• The Winner's Brain, Jeff Brown and Mark Fenske,
  with Liz Neporent, Da Capo Press
• Baseball Prospectus 2010, Steven Goldman and Christina Kahrl, eds., John Wiley & Sons, Inc.
• Libertarianism from A to Z, Jeffrey A. Miron, Basic Books
• and others ...

I'm also beginning work on an RPG, but it's in only the very beginning stages.