You must keep in mind Google's perspective. They have a firehose of great candidates to choose from, requiring an assembly line of recruiters and interviewers to filter them. They could use any filtering method, no matter how inaccurate or impersonal, and still get a large group of great people.
So that's why I didn't hear back from the (initially enthusiastic) Google recruiter.
(edit): I re-read the email thread and I think I was being unfair in the previous iteration of this comment. "See randomness" and all that.