1 in 6 Americans or 15 percent of U.S. adults now use an e-reader or electronic reading device, almost double the 8 percent in 2010. What’s more, of those Americans who don’t have an e-reader, 1 in 6 plan to get one in the next 6 months.

Based on a Harris Poll of 2,183 adults in July 2011, those with e-readers also tend to read more than American adults in general. While 16 percent of Americans read 11-20 books per year and 20 percent read 21 or more books per year, a third of e-reader owners (32 percent) read 11-20 books a year and over a quarter (27 percent) read 21 or more books per year.

A survey of 726 Americans by Ongo shows that more than half (56 percent) visit the Internet once or twice per day to read or view news. Nearly a third go online for news three or more times a day.

In other findings, Ongo reports that:

The Internet video advertising industry – online video advertising networks, media serving platforms, auctions and exchanges – is on track to make $1.4 billion in revenues in 2011.

This is based on CPM (cost per thousand view) fees, transaction fees and other fee-based revenue, indicating an impressive 67.5 percent p.a. growth rate, according to AccuStream Research.

176 million U.S. Internet users watched online video content in May 2011 for an average of 15.9 hours per viewer, according to the comScore Video Metrix service.

The more than 8 out of 10 U.S. Internet users (83.3 percent) who watched online video, mostly did so on Google Sites (mainly YouTube.com), which attracted 147.2 million unique viewers during the month.

A recent Adweek/Harris Poll shows that nearly 8 out of 10 (77 percent) of U.S. adults have watched a TV show on the Internet rather than on traditional television.

While no-one is abandoning cable or traditional television for the Internet just yet, over half of Americans with cable (56 percent) say they would replace cable with the Internet under certain conditions.

Surprise, surprise. People who own tablet devices such as Apple’s iPad tend to spend less time on desktops, laptops, netbooks and e-readers.

According to the results of The Nielsen Company’s survey of 12,000 U.S. tablet users, 77 percent of tablet users now use their tablet devices for actions they previously performed on their laptops or desktop computers.

Owners of smartphones download an average of three (3) shopping-related applications to their device, according to research by PriceGrabber.

Based on surveying 7,987 consumers in March 2011, PriceGrabber found that the average smartphone owner downloads 21 apps, three of which are shopping related.

The U.S. will have 20 million ereaders in consumer hands by the end of 2011, according to eMarketer. This is up from 12.7 million last year.

About 8.7 percent of U.S. adults will have a Kindle, NOOK, Sony Reader or other ereading device by the end of the year, growing to 12 percent by the end of next year.

About 1 in 10 clicks on paid search advertisements come from mobile devices, according to March 2011 research from Performics.

Performics found that while about 10 percent of online search ads were displayed on mobile devices in March, they also got 9.8 percent of all clicks during the same period.

Major news publications can ask for subscription fees and erect paywalls all they like, but a recent study shows that 80 percent of U.S. adult Internet users are NOT willing to pay a single red cent to read a daily newspaper online.

Recently The New York Times joined a growing list of major daily news publications that require visitors to pay subscription or other fees to access news content. Other prominent news dailies to do so include The Times in the United Kingdom and the Australian Financial Review in Australia.