Happy Birthday, IMDb!
IMDb is probably the best example of the power of relational databases and the self-publishing nature of the Internet. There is probably no commercial entity that would have taken on such a project -- creating a searchable database of virtually every movie and television program ever made, cross-listed by actor, show, etc. -- nor any sort of public entity. No one would have seen any money in it. But it's a truly invaluable resource for nearly any bit of information regarding who played what character in what movie and what else they've been in.
About the only good correlation we can think of for an archaeological application would be a complete searchable bibliography with keywords, authors, etc. Something like EndNote with hyperlinks.
If any wealthy archaeological enthusiasts out there want to pay us to develop such a thing, we're game.