Many of you probably have seen Daniel Larson speak at one or more SharePoint conferences and know that he is big into Ajax. Daniel's newest book from MSPress - "Developing Service-Oriented AJAX Applications on the Microsoft® Platform" is now available from Amazon for preorder.
Check out Dan's blog post "Pre-order on Amazon: Developing Service-Oriented AJAX Applications on the Microsoft® Platform". Dan is going to give away the first confirmed pre-order book.
Good Luck.