Probably many people is already aware, because this information has created many headlines and hit the media.
Yes, Microsoft has reportedly taken down the Rustock botnet, like they did before with Waledac.
I tend to think It was a coordinated effort with many researchers and institutions involved, but we cannot deny that Microsoft has the needed resources to make it possible :)
This is a small compilation of articles/post I have found on Internet:
Really nice explanation by Brian Krebs, as always :)