I find it's a lot easier to get through longer articles if I print them and don't try to read them on-screen. Something about reading from a physical piece of paper really makes it easier to focus. You can't ALT-TAB to another application. No alert popups from your chat client. You can underline, make notes in the margin, etc. which also helps.
Just curious, I just can't understand how underlining in different colors and taking notes in the margin helps anything. I recall trying to take notes in university classes, but I just stopped, since taking notes at the same time as listening to a lecture makes it difficult to follow the lecture (that you're there for in the first place). In the end, I didn't take notes for 4.5 of the 5 years I was in school, and had good grades. But maybe it just worked for me?