Online stalking has gone programmatic. People search engine Whoozy has a person search API. With it, you can get results for a name from social networks and blogs, in addition to standard search engines.
After much anticipation since its private beta release in March, Yahoo! has made Fire Eagle publicly available. Fire Eagle is an open geo-location platform that allows users to broadcast their geographic location to the Web while at the same time giving the the ability to easily control how and on which sites location data is shared (our Fire Eagle API profile).