Here is an interesting search engine toy you can play around with: the search engine blind test. Type in a keyword and see the results in 3 columns (Yahoo, Bing and Google, but without any branding). Pick the one you like best and then see which is which.

Though not as a blind testing tool, we have always had a software tool to compare the three search engines (even when Bing was Live).

You can compare the search engine results from Google, Yahoo and Bing side by side using a unique 3 column window in SEO Lab Professional or Gold.

Not Using SEO Lab?

SEO Lab is the premium competition research tool available for Windows and Mac OS X users.  It is primarily aimed at SEO specialists. You can download a free, fully functional, 30 day trial .