Linked Galaxy is a tool that uses semantic entities that were identified by Zemanta in given text and connects it to DBpedia and Freebase by following connections between them. This way it’s possible to uncover underlying connections between the terms that might not be otherwise obvious to the writer. They are presented in a graph, making it easy to quickly scan the output.
A text about Hudson River landing earlier this year produces the following first order graph from DBpedia:
Once it’s expanded into second order, we can already see connections between the entities (click for bigger image):