But besides all these talk about Enterprise 2.0 and Web 3.0, there has been lots of exciting stuff happening on the AJAX front.
1. Recently, Ajaxian talks about how the current use of Ajax is not really true "asynchronous communication." Among the four kinds of asynchronous usage proposed, Microlink is something that stands out. Check out the demo for TiddlyWiki, its fantastic, although I feel its a bit confusing.
2. ZK is now among sourceforge.net most active. The live demo is impressive as well.
3. Google has released a new search API that lets you add an Ajax version of Google Search to your site (instead of just a simple search box that redirects to the Google webpage).
Lastly, if you don't want to hear anything about Ajax, you might want to check out some of the cool stuff that have been produced in Blender.