I'd like to do some analysis of the search-engine queries that people
submit. Are there any programs that collect or "scrape" the scrolling
list of search queries displayed by Metaspy (for Metacrawler), or
SearchSpy (for Dogpile)? I'd need to collect several hundred thousand
queries, so I'd have to be able to set up the program and let it run
until I had enough data.

I think you can do something like that using Google API's
You can make a seach attacks and get the expected results count from
google suggest so that you can know the top quesries.
This is just an idea :)

Ahmed Hashim
Software Engineer
Egypt
http://www.egjug.org