I just posted about my experiences writing my third technical book, Wrox Professional ASP.NET MVC 3, along with Phil Haack, Brad Wilson, and K. Scott Allen. We had a general discussion on the latest episode of Herding Code with the Wrox MVC 3 book authors and Jesse Liberty, author of three dozen odd books.
Professional ASP.NET MVC 3 has been available on Amazon for a few weeks now. It's had a pretty wild ride so far, including being listed as the top selling book Programming book on Amazon, followed by the Kindle version in second place. For a few crazy days, it was one of the top 1000 books across all of Amazon - take that, Herman Melville!