In a national survey between November 30 and December 27, 2009, the Pew Research Center's Internet and American Life Project found:
74% of American adults (ages 18 and older) use the Internet – a slight drop from our survey in April 2009, which did not include Spanish interviews. At that time we found that 79% of English-speaking adults use the internet.
60% of American adults use broadband connections at home – a drop that is within the margin of error from 63% in April 2009.
55% of American adults connect to the Internet wirelessly, either through a WiFi or WiMax connection via their laptops or through their handheld device like a smart phone. This figure did not change in a statistically significant way during 2009.
Read the full report Internet, Broadband, and Cell Phone Statistics on the Pew Internet and American Life Project's Web site.