Thanks to everyone who came along yesterday. I was concerned that I may end up talking to an empty room as I was up against Jeff Prosise's Silverlight 2 session. In the end I needn't have worried as there was a good crowd of people there eager to hear about ASP.NET AJAX controls. Phew.
A few people asked for my demos so I've published both the slide deck and the demos.
I should mention that the website is optimised for display at 1024x768 (the resolution we use for projecting). In other words, it will look odd (terrible) at higher resolutions as the background image is 1024x768. If it's really upsetting you, just delete/rename Background.jpg in the Images folder or change the background rule for the body element in Images/Default.css by removing the background-image.
I intend to distill some of that down and write a few blog posts about the basics of building and using components, behaviours and controls and wrapping them as ASP.NET server controls.