One-third of U.S. Net surfers have gone wireless

The survey also found that 20 percent of Internet users now have wireless networks available at home, double the number recorded in January 2005.

"We know that 'always on' broadband connections really deepen people's relationship to the Internet; adding 'on the go' to the mix takes this a step further," said John Horrigan, associate research director at the Pew Internet Project. "The convenience of wireless access gives people the chance to fire off a quick e-mail to someone while waiting in a doctor's office or check the news headlines on the way to work."

Some 34 percent of Internet users surveyed said they have logged on to the Web using a laptop computer, handheld personal digital assistant or cell phone.

The survey of 798 Internet users has a margin of error of plus or minus 3.8 percentage points. Detailed results were posted on the Web at the Pew site.