Brave New Word: When not to use AJAX for Dummies: "February 14, 2006
When not to use AJAX for Dummies
Somehow, AJAX became synonymous with rich UI, and that is the same thing as saying that HDTV signals will result in better TV content.
Some sites are using AJAX in the wrong place.
IMHO, Ajax works great if you have a dynamic UI that can't load all data to do its job at once, or, the data is dynamic and refreshing the page costs a lot more than the AJAX overhead."