It's an experimental app searching through the 11 Bill docs stored at archive.org by keywords. It comes with date limiters, so you can search for pages on any subject in a specific timeframe. The ranking is content based.
Additionall features: - graph displaying the number of pages over time - related topics to further refine searches - graph showing the main related topics popularity in time
I suppose this number includes all time snapshots from a page, or!? If so, i wonder how many "real" unique pages they indexed? The 11 billion pages could get cut down to just a few 100k unique pages. I can't find any number about the unique pages neither on archive.org nor on recall.archive.org.