Google seems to be growing exponentially. During the month of August alone they were reported to have had 31 billion queries throughout the world. In total more than 37 billion searches were carried out across all Google sites. Second on the list was Yahoo!, which had a paltry 8.5 billion searches recorded during the month. Yahoo!, Ask, and MSN Search do not come anywhere near being as used or have the level of usage. Although there was a poll conducted recently showing that Yahoo! had a slight lead for users in terms of being a favored search engine. These users still seem to be using Google anyway.
The Asia-Pacific region, including China, Japan and India, contained the greatest number of unique searchers, with 258 million conducting over 20 billion searches during the month.
Since Google has such dominance, as far as search engines are go, they also can greatly influence the way websites are designed, how people market their sites, and to that end, which websites people visit. They can also pretty much dictate the cost of advertising as well. This level of control over something so pervasive, being the internet itself, makes one think that they have more influence now than Microsoft ever had during its hayday.
I believe they are bordering on monopoly control of the internet. I wonder if they will be eventually targeted for regulation or some sort of government instituted penalties, such as being broken up.