Thanks to everyone who attended! You can find the deck and demo code here:
http://cid-3e032ee80e5d5e45.skydrive.live.com/embedrow.aspx/Public/ASP.NET/4.0
Slide 40 of the deck has links to get the demo code. Once the next preview release of ASP.NET 4.0 AJAX is published, I will blog about where you can get the samples I demonstrated (DataView / Client Templates).
I will try to get the recording of the developer dinner published within the next week.