Ajax Mistakes
After all the hype around Ajax, here are the first warning signs.
Ajax is an awesome technology that is driving a new generation of web apps, from maps.google.com to colr.org to backpackit.com. But Ajax is also a dangerous technology for web developers, its power introduces a huge amount of UI problems as well as server side state problems and server load problems.
Actually not the newest article on the subject, but a nice list of what you should avoid when designing under this new paradigm. I especially liked the following points. You shall not:

