Medieval-Renaissance Studies 

Is visual-based learning your preference?  If so, you may find the following seach engines/options helpful.

Quintura
http://www.quintura.com/
Search the web, or images and videos.  Utilizes word clouds.

Grokker
http://live.grokker.com/
Search Yahoo!, Wikipedia, and Amazon simultaneously and review/narrow results through an outline or map view.

EBSCO Visual Search Feature
In any EBSCO database (such as Academic Search Premier), select the Visual Search option and view results as a faceted cluster in either a block or column format. If you would like more help with this feature just see a reference librarian.