An interesting article recently published in "Inside Higher Ed" noted the so-called "Google Effect" of conducting research -- www.insidehighered.com/news/2010/09/29/search. One way to see the differences in search engines is to use the site Bingle, which searches Google and Bing simultaneously -- www.bingle.nu. While I don't usually encourage the use of generalized search engines, in some cases, these sites may offer some relevant information. By all means use Bingle to cut down on your research time and multitask the two major search engines at once!