Check out the dbpedia graph, they're doing much of this already. For example, for structured info about San Francisco: http://dbpedia.org/page/San_Francisco htt

Check out the dbpedia graph, they're doing much of this already. For example, for structured info about San Francisco: http://dbpedia.org/page/San_Francisco http://dbpedia.org/page/San_Francisco Here are their datasets: http://wiki.dbpedia.org/Datasets http://wiki.dbpedia.org/Datasets