Ha, I've tried this, but to limited success. UofMich posts their entire admission committee online, so I spent some time searching for each name so I at least knew what they did (major research interests, specialty). Unfortunately their list wasn't really complete, and I didn't know anything about my interviewers.
At some (most?) schools, they give you the names of your interviewers long before the interview. If there's a break in the schedule, you could find/bring a computer and see what you could about them...
I don't really think it's going to help you at all, though... They may just be scared of you if you come in saying "Hi Doctor Jocobs, I loved your paper from last year, I was really interested in your findings with gamma-IFN. How's your wife Laura doing, I heard she had the flu last month..."