ASP.NET AJAX has just RTM-ed. Even cooler than that is the release of the SharePoint AJAX Toolkit on CodePlex, which uses the ASP.NET AJAX framework. This sounds very promising, especially with all of the SharePoint work we have going on.
Daniel writes: ASP.NET Ajax Extensions (aka Atlas) have been released (finally!), and I've been saving up some code for the release which I'll post shortly. (Get the 1.0 RTM bits here: ASP.NET 2.0 AJAX Extensions 1.0)The SharePoint Ajax Toolkit is also ready for release and is available as a WSP (SharePoint Solution Package) here with some nifty new features, including a Solution Package based installer that allows FULL no-touch deployment and registers the Atlas httpHandlers, as well as a Refresh interval programmed into the XmlWebPart (a great solution for SharePoint list RSS feeds). Included is one web part, the Xml Web Part (with a default RSS reader XSLT which can be set to auto refresh), and the core framework for AJAX developers. The source code is recommended for SharePoint developers.
There'a a lot of goodness coming out right now. It's a very exciting time to be who we are!