(In a study by the Nielsen Norman Group, co-principal Jacob) Nielsen found that those reading the e-book version were as much as ten percent slower than those who read the printed version. Those who read the story on the PC took even more time, and universally rated by participants as the worst way to read.
Read the full piece at betanews.com
This was all over CNN and other outlets as well. I tracked down the original source (see link above) to get the unvarnished details. But it is a little hard to wade through. Maybe because I’m reading it on a PC?