A few weeks ago I wrote about an iPad usability study by the Nielsen Norman Group. Jakob Nielsen has now published a study of people reading text on tablet devices. He compared Apple’s iPad, Amazon’s Kindle, a PC monitor and a printed version of a short story by Ernest Hemingway. The sample size was 24 participants, all of whom liked reading and frequently read books. Findings indicated reading the printed material took the least time. Reading on the iPad was 6.2 % slower and on the Kindle was 10.7% slower, though Nielsen is quick to point out that the difference between the iPad and the Kindle is not statistically significant. More on this study and the results here.