I would really like a "raw" web search engine, just an SQL interface to an as-comprehensive-as-possible index of links.

SELECT title, last_modified, url FROM index WHERE content is like '%otter%' and content is like '%Iowa%' ORDER BY...

The service could offer all kinds of algorithms in clever, ORDER BY functions, but I'd get to choose which in my query (and can always go with ORDER BY last_modified DESC if I wish).