As I”ve said before, I”ve written a book (portuguese only) about ASP.NET AJAX. After waiting for a long time, it seems like the book is out! (unfortunately, there”s no direct link for a complete page because they keep on insisting on using iframes. if you want to get all the info about it, you”ll have to go to their main site and search for the book).
I”d like to thank all that have contributed to the book (specially Joao Cardoso, which did a lot of reviewing and gave me lot of feedback). btw, do keep an eye on the FCA web site because they will be updating the site with the code and errata (yes, unfortunately there are one or two things which changed after I”ve delivered the final draft).