bwnbwn - 9:37 pm on Apr 12, 2011 (gmt 0)

Our company runs a number of sites in different nitches and can tell ya this one nitch might be 85% google 15 Bing yahoo, another might be 60% Google 40% bing yahoo, and another might be 50% Google 50% bing yahoo. It looks to me the older users are bing yahoo and the more hip nitches are google.
I built a new site about a year ago about a new goverment regulation for an industry. The ones that would be searching for this would be older middle aged men being the majority and maybe a small % of women in the upper level of managment. The site has always been 60% google 30% bing and 10% yahoo. I made a post about this a year ago. Just seems to be nitch specific.

Numbers from that site today.
39.60% www.google.com
30.07% www.bing.com
24.88% search.yahoo.com