The biggest problem when polling people about their favorite search engine is preconceived notions about their effectiveness. You think Google is the best because that's all you have ever used and you generally don't like Microsoft. Alternatively you love Yahoo Search since it's your portal page to everything else you use (mail, stocks, weather, news, etc). You don't really give other search engines a chance since you stick with what you know.
I stumbled upon this cool project by a Microsoft employee (but supposedly not affiliated with any sort of Microsoft research). Essentially you type in a search query and it goes out and searches Google, Bing and Yahoo. The results are displayed in three unmarked columns and you select which one has the most relevant results. The results may surprise you...
Check it out at
http://www.blindsearch.fejus.com.