Its been a while now, but here it is anyways...
About six or seven weeks ago, I scored a phone interview (technically two) with Google's IT department for a summer internship. Nobody was more surprised then I was that Google actually found my resume somewhat impressive enough to warrent a phone interview, especially considering my less-then-stellar GPA and the enormous number of super-intelligent applicants Google recieves every day. The two interviews were each forty-five minutes long, and the interviewers (both intelligent IT guys, and not technically incompetent manager types) took pretty much all of the alloted time.
These days, almost every CS guy dreams of working for Google and so I've heard a few things about their interviews before, which I would like to mention before I get into my interview. A few years ago when I was an intern at Intel, they had a lady come in to tell all the high school interns about how to be successful in scoring future jobs. She spent a lot of time teaching us how to walk properly, shake hands, sit in a proper manner, dress, and answer generic interview questions. She told us that Google interviewers like to ask broad open ended questions like "how would you sell ice to an eskimo" and "why are manhole covers round," and promptly put us to answering similar questions. A few months later, I went to a Google Tech Talk at my University, where a Google software engineer was asked by someone in the audience if Google did in fact like to ask interview questions like "why are manhole covers round." The Google rep resonded with the following:
"In my time at Google I have interviewed several software engineers and I have never asked a question like that before. Google is not in the business of making manhole covers. If we did make manhole covers, we might ask those kinds of questions."
I think occassionally, a Google interviewer might throw in a brain teaser if they just want to burn some time, but apparently they don't do it too often.
Anyways, going on to my interview... I was interviewing for an IT position, so unlike the software developer positions where they barrage you with an endless stream of algorithim and programming questions (Why is quicksort log(n)? Whats the best sorting algorithim to use in this scenario? What data structure would you use for this? etc.) there was almost no programming invovled in my interview. And since the recruiter and HR person told me pretty much nothing about what I should expect, I went into the interview pretty much cold.