An interesting, if long, video: http://www.youtube.com/watch?v=S5aJAaGZIvk&feature=PlayList&p=41F4CEB92D80C4B7&index=0
Main theme is HTML 5. The consequences of it for Silverlight merit quite a bit of thought. Silverlight comes with far better tools, of course - the dev experience will be very hard to compete against. But HTML 5 will have the advantage of ubiquity.
The other very interesting demo - for me, at least - was Java support in Google App Engine. It's an Eclipse plug-in with a built-in deployment support, GWT (http://en.wikipedia.org/wiki/Google_Web_Toolkit) and server-side support all built-in. Not nearly as slick as ASP.NET, but definitely a step in that direction.
A minor thing that I found quite funny, actually, was that the main presenter on the conference was Vic Gundotra - a former marketing/evangelist guy from MSFT who is now a VP of Engineering at Google. The silliness of Google management strikes again - say what you want about Microsoft, but at least our engineering managers are real engineers :-).