JGE Automatic Content Generator is a PHP script that will automatically add relevant content to existing web pages. Uses Calais to perform semantic analysis of an existing page's content to find essential keywords and then pull content relevant to these keywords from Freebase.
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.