I have to say, this comment by Armin Vit of Under Consideration/Brand New sums it up, perfectly:
The aforementioned link with Guidelines:At first glance, this has the potential of being one of the most significant visual improvements to the web in general.
I may be over-praising this but once you see the extent to which Google has gone in explaining its design approach and the stunning quality in which it’s presented you might join the conga line. Take 10 or 15 minutes go through the online guidelines, like, really look through them. This is the kind of commitment to establishing rules that makes vendors and developers take notice and realize that there is a high standard to meet. The overall message isn’t “Make the Best Design in the History of the World”, it’s something more like “Stop Designing Shitty Things Online”.
http://www.google.com/design/spec/mater ... ction.html
Demo Reel of the highlights:
Now, if they could only get ALL their devices running the same OS release...