Is Google No.1 Forever? (The SEO Blog)
“Google is without a doubt the world's number one search engine. According to the research firm Neilsen/NetRatings, Google's share of the global search market in February 2006 was 48.5%, more than double the 22.5% share its nearest rival Yahoo saw.
Having been the engine of choice for nearly five years, Google is synonymous with search. Because Google is the first thing most folks think of when they think about search, it is the most important search marketing venue, at least for the vast majority of SEOs.
That might be changing in the coming years.”