Yahoo has released an update of the Yahoo! UI Library. These are very nice widgets that you can assemble to build sophisticated AJAX sites.

The systematic approach and continued attention to these widgets is very interesting. Feels like the early days of the traditional (desktop) UI widget days. Fancy AJAX is going to become a lot simpler soon and having it will be default. I saw demos of two internal applications (limited audience) that had very nice AJAX interfaces in the past week.

I wonder what Web 2.0 will mean once everybody’s site is AJAX’d out.