ASP.NET AJAX has just been officially released. ASP.NET AJAX is a free framework for quickly creating a new generation of more efficient, more interactive and highly-personalized Web experiences that work across all the most popular browsers.
There is a ton of high quality documentation which is always a given with Microsoft toolkits. The site also features live previews of the the toolkit controls. It’s a great way to see some of the cool stuff things you can do with AJAX. The quality of the controls is a bit uneven however. Some controls are gorgeous while others are very basic. For instance the Animation control produces some great effects but the rounded corners control does not support anti-aliasing which makes for some poor looking rounded boxes.
I’m planning on using this toolkit in several projects and reporting on my experiences along the way. Stay tuned!