Bookboon.com, a free eBook website based in Denmark, reported this week that its site traffic grew by 500% over nine months of 2011. The site, which has free textbooks, business books and travel guides in about a dozen languages, expects to penetrate 10% of the U.S. market share by Q3 2012.

The press release explains more: “Bookboon.com has grown globally by over 500% when comparing January 2011 to January 2012, and the company expects more than 50 million downloaded eBooks in 2012.”

Thomas Buus Madsen, COO of Bookboon.com, stated: “Our users feel our concept is worth sharing with friends, especially because all our content is free, platform independent and does not require user registration.”