This is great. I'm using Dart on a (smallish) project, and I really like it. I'm a little nervous about whether it will be around in five years, and stuff like this really help reassure me on that front.
Most of the use of Dart at Google is client-side code running in the browser, but there's server-side use too. One example: Google Fiber settop boxes run server-side code on the Dart VM.