ajax personalization
This shows a useful application of AJAX -- publishing entirely static HTML files, but adding dynamic elements through AJAX. This gives you roughly an order of magnitude more "scalability" than fully dynamic pages, and avoids complicated component caching schemes.
For the example, "log in" with any (fake) user id in the right column. The page uses AJAX to display the correct components for personalized content. Hit reload to be sure it's working. Log out and try again.
AJAX-free browsers get nothing.
The fake content is about your favorite winter olympic sport. Everybody loves customization.