I note from the Convera sponsored E-consultancy survey of professional search behavior, titled the "Vertical Search Report 2008", that Google is particularly dominant amongst those who use Web search a lot.  Business people who use Web search engines between 1 and 5 times per day, according to the survey, are more likely to use Yahoo! or a vertical search engine from a B2B website. Google only ranks third amongst this group.  In contrast, professionals who deploy more than 20 Web searches per day almost always use Google.

One interpretation of this result could be as follows:  The people who search more than 20 times a day are likely to be involved in some kind of internet marketing activity, where Google is centric to their business, be they an advertiser, publisher, SEO practitioner or other kind of internet marketer.  The people deploying 1 - 5 searches a day may be a more diverse group of professionals whose world does not revolve around the Web.  They are a more likely target audience for specialist vertical search plays, who will likely find encouragement in these numbers. 

A free copy of the full Vertical Search Report 2008 can be downloaded here