Cross-database search tools

[Roy Tennant]

I am trying to survey any cross-database search tools that are 
presently in production. These are applications that take one search 
query, send it out to multiple databases and return organized results 
(not necessarily de-duped) to the user. Some examples:

Searchlight at the California Digital Library
http://searchlight.cdlib.org/cgi-bin/searchlight

Flashpoint at the Los Alamos National Lab
http://flashpoint.lanl.gov/

Multi-SEARCH at the University of Arizona
http://www.library.arizona.edu/indexes/links/multisearch.shtml

Are there others? Also, if there are is a contact for any such tool 
that wouldn't mind answering a few questions that would be even 
better. Thanks,
Roy