I didn't specifically prepare for my interview with Google. A quick poll of my office mates indicates that they didn't either. This might not be typical, but I

I didn't specifically prepare for my interview with Google. A quick poll of my office mates indicates that they didn't either. This might not be typical, but I don't think the OPs degree of interview preparation is necessary. I've interviewed (and gotten offers from) Microsoft and Amazon as well. Their interviews were different (Microsoft asked more puzzle-type questions, Amazon was very OO-focused), but I didn't feel like the Google interview was substantially harder or easier.