Interesting anecdote about the Android acquisition: Larry and Sergey bought the company without telling Eric Schmidt about it[1]. Google moved into the mobile market on a whim.
Google's strategy seem a lot more planned and methodical from the outside.
[1] From a Schmidt press conference last year: "Android purchase, he didn’t even notice Larry and Sergey bought it." - http://searchengineland.com/live-blogging-sergey-brin-eric-s...