I demoed much of this stuff as part of my Mix talk, but I wanted to highlight a few here for
New functionality includes CSS selector APIs, navigation history support (Back button support), a utility for extracting resources from assemblies, and more. Check out my mix talk for some cool stuff on back button support.
Enables the ability to include media (video, audio) vector graphics, and animations by using familiar and powerful ASP.NET server controls. This is very cool because it enable server side databinding for video, audio, etc.
Introduces a set of data controls that provide a simple, intuitive user interface for data-driven Web pages. Check out Maheshp and Polita's talk from some cool demos.
Offers new application services to make AJAX and Silverlight Web applications more discoverable from search engines and easily searchable from within the site. Additional services help you gather and analyze data about client errors.
Begins support for two languages that are hosted on the DLR, IronPython and Managed Jscript.. Check out Just Glue it...
oh, and be sure the check out the reference pages we have for this release. I think it is very complete for such an early release.
I would really value your feedback... we are looking forward to hearing from you about what works and doesn't work in your applications so we can decide what to focus on for a future release.