I have found a great article about developing a application with ajax enabled rich text website.
Here is the three mistakes we are making..
- Page events still fire during partial postbacks.
- UpdatePanel events fire, even when not updating.
- Control event handlers fire after Load events
Dave has posted a very good article on above mistake.
Here is the link for that..
http://encosia.com/2007/10/24/are-you-making-these-3-common-aspnet-ajax-mistakes/