I have a contact at HR there and a couple of friends (NYC office). I've entertained going there a few times over the years but never got the feeling there's much growth. Too many Type A personalities too.
Oh and to the OP. I interview 100s of developers a year. Sometimes it goes great but we don't hire the guy because one of the interviewers had a minor objection or another candidate was just a little more of a fit. Keep trying. If you have an HR contact at Google, ping them again in six months and ask if there are any new spots. The Google HR department seem really proactive at getting talent in, so unless you totally bombed out you probably have another shot somewhere else in the company.