Today MS-Press will be printing the hard copies of "Inside Dynamics AX 2009". The books will hit the shelves later this summer. I can hardly wait to hold a copy; and to get your candid feedback.
Here is a link to more details on the book. As you can see the book contains over 200 pages more than the AX 4.0 edition - I think this very well reflects all the new functionality added in AX 2009.
I've also heard rumors about an ebook version, and a Russian translation. Stay tuned for more details.