UPDATE 25th April 2011 - Visual Studio Async CTP (SP1 refresh) now available.
Thanks to all the nice comments from people who attended my presentation at DDD9, and extra thanks to Jon Skeet, Mark Rendle and Mike Hadlow for coming on stage for the last ten minutes to help debate whether the Async CTP is the correct way to go to enhance C# 5.0.
The presentation is available at Prezi.com http://prezi.com/gysz5nohltye, which I can recommend as a refreshing change to the more standard PowerPoint slidedecks.
I've also uploaded all the code samples into a single ZIP file. You will need to install the Async CTP to be able to run them, and I would remind everyone that the current Async CTP is not compatible with either ASP.NET MVC 3 RTM or Visual Studio 2010 Service Pack 1 so you may need to use a test system of virtual machine to play with it!
Source code - http://www.tigernews.co.uk/blog-twickers/ddd9/AsyncSrc.zip
Again, thanks for all the positive feedback and the whole of the DDD team for putting on a fantastic conference for all the presenters and delegates.