Google Google Everywhere

From Where Are All The Google Data Centers? by Erick Schonfeld:

Google’s data infrastructure is massive and spread across the world. All that Web crawling, indexing, and searching takes enormous amounts of computing power, not to mention everyone pounding away at Gmail, Google Apps, Blogger, Google Reader, and every other project dreamed up at the Googleplex. But where are all of these data centers and how many are there? Google doesn’t really say. But that doesn’t keep people from trying to figure it out.