Ajax Sucks Most of the Time (Jakob Nielsen's Alertbox December 2005)

Ajax Sucks Most of the Time (Jakob Nielsen's Alertbox December 2005): "For new or inexperienced Web designers, I stand by my original recommendation. Ajax: Just Say No.
With respect to the use of ajax by highly skilled Web designers, I have changed my opinion somewhat: people who really know what they are doing can sometimes use ajax to good effect, though even experienced designers are advised to use ajax as sparingly as possible. "

A timely reality check.