Saw this feel good article today about a 13 year old boy using whitepages.com to track down the owner of a class ring that he found on the beach with his metal detector. I bet the owner was ecstatic to get this keepsake back.
I would wager that there are countless stories like this every day where people have been successful using a people search service to track down the location of someone.
Would love hear your successful people search stories.