Yesterday, I turned in the final chapters for my upcoming O'Reilly book on digital identity. There's still plenty of work left with editing and what not, but its good to have the writing done. The book has three sections. Part I is about digital identity concepts. Part II is about digital identity technology, and Part III is about building an identity management architecture, or IMA. An IMA is aimed at creating flexible, interoperable identity infrastructure in loosely coupled organizations. I'm pretty happy with how it turned out.