A new Pew study asserts that almost a half of internet users access search engines daily, and about 60% email daily. Other popular Internet activities include checking the news (39% do it daily) and checking the weather (30% do it daily).
Fallows, D. (2008). Search engine use. Washington, DC: Pew Internet & American Life Project. http://www.pewinternet.org/pdfs/PIP_Search_Aug08.pdf