Stepping away from the computer with a hard-copy is my own personal preference. Although, as someone who is easily distracted, I find it best to turn off the computer, leave all my gadgets behind, and (on a nice day) sit outside with nothing to distract me from the documents I have to read. By keeping the distractions out of sight, we are less likely to be constantly tempted by them, and our willpower won't deplete so quickly (I highly recommend Baumeister and Tierney's book on Willpower - a review by Steven Pinker is available here ).
When a hard-copy is not appropriate there are a number of software solutions, for example, www.rescuetime.com which allow you to place limits on the sites you visit. This is particularly useful if you find yourself constantly being distracted by the same sites (e.g., Twitter or a particular news channel). However, when I have tried these services I end up wasting more time as I try to get around them.
Unfortunately - the none-to-helpful answer is - the best way to cultivate the reading habit is to start reading. Reading the first paper may be tiresome, but the second will easier, and the third easier still. Not only because you will develop the reading habit, but the hard concepts will become easier as you see them discussed multiple times in multiple different settings.