AJAX on MOSS
We have working on getting AJAX to work on MOSS with a few tweaks here and there. We knew that this wasn't officially supported and there were still a few unresolved issues like Expander control and the !DOCTYPE tag.
However with the release of MOSS SP1, ASP.NET AJAX is now officially supported on MOSS. I am currently in the process of downloading the same and can't wait to try AJAX on MOSS. Hoping that all issues would have been resolved and we will no longer need to do our custom tweaks to get AJAX to work on MOSS.