There used to be java applet embedded in altavista.com's website that could be run against search results. It would do semantic processing on the results and present a list of generated terms, each with a checkbox. Checking a box would pull any returns which contained the topic from the remaining search results.

This was fire. If a topic were being discussed on the web, you could find it with this tool. Unfortunately, it did not fit the vision of the parasitic overlords who bred us to produce and consume for their benefit.