“FindSame is an entirely new kind of search engine that looks for content, not keywords. You submit an entire document, and FindSame returns a list of Web pages that contain any fragment of that document longer than about one line of text.
Documents with copied or plagiarized content
Outdated or updated documents
Copied and quoted press releases, information sheets, and websites
Resources or communities on a topic of interest
Source code and software in use”
You can also use it so see where some content is syndicated.”
08/04/01 update: “Digital Integrity is no more” but I don’t know when it happened.