Forum Moderators: open
Archive.org now has a search engine that has crawled 11 billion pages of it's own web space. The search results are pretty low quality as it is 100% on-page based, but the really interesting thing is the graph of number of pages over time that match this search phrase. And the categorical matching. All in all, this definitely fits in the category of "pretty cool".
Spotted by heini, September 4, 2003:
Advanced Keyword Search at the Wayback Machine [webmasterworld.com]
I like it!