Google Side-By-Side search comparison tool...

If you have not tried it, you should!
Start comparing your results and see what you might be missing.

The Side-by-Side search comparison tool compares search results from the Google Search Appliance or Google Site Search alongside results from any other search engine or alternate appliance or Site Search configurations. Allow your users themselves to vote on which set of search results they like best!

Project Home: http://code.google.com/p/sxse/ [5]
Downloads: http://code.google.com/p/sxse/downloads/list [5]