From the article:
A new release from Nielsen//NetRatings announced that, among the three key Web categories, search providers had the highest visitor retention rates, with an average of 71 percent of June visitors at home returning in July. Google Search led, followed by Yahoo! Search, and MSN/Windows Live Search. Visitor retention rates were slightly higher among the work audience.For complete information, view the press release at nielsen-netratings.com.
My thoughts: I think search engine used depends on your browser and your options.
With Internet Explorer, you have a home page and that is usually keyed to the webmail service you use. You are basically trapped unless you have bookmarked other search engines.
If you use FireFox, you have the ability to add multitudes of search engines to your browser as add-ons. I tend to use specific search engines for different tasks. If I use Yahoo! and do not get the answer in the first few results, I switch to Google; if I am still not happy, I go to Ask. I never use MSN. If I am looking for definitions, I use Webster; if looking for a movie, I use IMDB; and for news I use BBC. Other options include Technorati, Del.icio.us, Weather.com, Amazon, eBay and Lonely Planet Online.
I love having choices. What browser do you use? Which search engines?