"While Yahoo! Inc and Microsoft Corp lag far behind Google in overall search share, their combined search penetration of 73 percent is not far behind Google, at 84 percent...Yet Google searchers conduct an average of 54.5 searches a month -- about double the number of searches that Yahoo! and Microsoft users conduct combined." Interesting way of looking at search market share data. The reason Google has such a high market share is primarily not b/c more people use Google but b/c users that use Google do more searches on Google relative to users of other search engines. - Evan Parker