[daveasdf]

A few years back (6 months before the first Bing study in the article) Michael Kordahi developed a site "Blind Search" that anonymised search results from Google, Bing and Yahoo and put them side by side, letting users vote which they preferred.

The site (http://blindsearch.fejus.com/) now seems somewhat-defunct, with Yahoo results failing show. Aggregated results posted mid-2009 (http://delicategeniusblog.com/?p=839) (a little earlier than the original study) show Google on 41%, Bing 31%, Yahoo 28%, however.

As a purely non-scientific anecdote, I personally used the Blind Search website for a month mid-2011, preferring Google around 75% of the time, Yahoo 15% and Bing 10% of the time. (The latter two are interesting, because Yahoo is presumably using Bing's engine behind the scenes.) I probably don't represent a "typical user", however, as most of my queries are programming-related, which perhaps some search engines have better optimised for than others.