Microsoft also tested multiple versions of blue for links in their search results. A specific color of blue (#0044CC) drove $80-$100 million dollars a year increase over the light blue the design team tried first.
(via lukew.com & found via Andrew Parker)
Andrew references Douglas Bowman in his post, who quit Google’s design team, citing an example of the time the company did extensive testing to pick from 41 shades of blue. It seems that perhaps Google have it right.