According to Pew Internet & American Life data, 41 percent of the Internet-using population in 2005, approximately 59 million people, made use of a search engine on a typical day in September.
The 2005 data represents a 55 percent increase over June 2004 when only 30 percent of respondents used a search engine on a typical day.
ComScore Media Metrix's data shows an increase in search engine usage from 2004 to 2005 of 23 percent. That is 60.7 million users in September 2005 up from 49.3 million in September 2004.
E-mail remains high on the Internet usage list with Pew reporting that in September, 52 percent of Internet users sent or received mail, up from 45 percent in June 2004.
Users are also spending more time with Web-based e-mail than search engines, according to data from comScore. They spent only 3.5 minutes on search engines on an average day while they spent 24 minutes on Web-based e-mail.
Pew notes in its data memo that the more time spent on e-mail is not surprising, "given the average time of a search compared with the average time of reading and writing e-mail."