Are you trying to rank well in Google? Or you are optimizing websites specifically for Google, trying to get ranked on Google more than any other search engine, and above all, advertising exclusively on Google. If your answer is yes, then you should look at some useful data.
Hitwise has released a stat in the month of April, that reinforce Google’s dominance in the search engine market – at least in the USA. Hitwise says that Google accounted for 64 percent of all US searches in the four weeks ending March 31, 2007. Their main competitors were far behind: Yahoo! Search got 22%, MSN Search 9% and Ask.com 3%.

The above data shows the Google dominance upto 64% on the online search market but we should also pay attention to the remaining 36% share as well.