I'm at MIX '07 in Las Vegas. Come find me if you're there (here).
Also, I should note (based on surprisingly copious amounts of e-mail I received) that I didn't comment on Microsoft's "announcement" of Silverlight at NAB because, well, there's no there there. Silverlight is the new name for what used to be called WPF/e - and the news at NAB was just that: a name change.
The actual technology available was the same February Community Technology Preview that had been available for months. I expect that will change this week, but I was impressed with the vortex of press MS was able to create for their naming ceremony :)
As an aside BubbleMark presents a very simple, very basic, and very artificial performance test (that is, I think the results are STRONGLY un-correlatable to any real world application), but its fun to look at the code for each version.
Updated: Yep - here's the new "1.1" Silverlight build, which includes the cross-platform mini CLR (essentially dot NET lite for Windows and OS X). The distribution size went from 1.1MB to 4.2MB (just a developer build - so no judgement yet). It will be interesting to see what the final size is once Silverlight approaches functional usefulness (its not there yet).