This is an experimental post in which I'm embedding a searchCrystal widget. Thanks to MaryH for pointing it out, and providing a concrete example of its use.
I discovered this interesting visualization tool on the IES Book and Literature Circle Blog, in The Little Prince Literature Circles Week Two post (2008.05.28), through a Learning with Computers network connection in a Shelfari Group: Book, Short Stories Suggestions for the Classrooms and Activities (2008.09.04).
According to the page where I got the widget embedding code for this post (seachCrystal: Widgets), "The searchCrystal Widget visualizes the overlap between the result sets of five major search engines," for example, images on Ask, Flickr, Google, MSN, and Yahoo! (searchCrystal: Home). In order to fit the current template for this blog, I reduced the size of the display (below) from a default 600 pixels square to 400 pixels.