Turbo10 is a search engine that trawls the Invisible Web for results.

From the site:"Turbo10 is a metasearch engine that provides a universal interface to Deep Net™ engines." Turbo10 connects you to deeper, more quality information from niche-specific search engines, and enables the searcher to access databases (such as government, busines and university databases). Basically, Turbo10 has cut out some of the middleman work you would have to do to get to these resources on your own.