Pretty much does what it says on the tin!
Most of my hour each way journey to and from work is underground, so I can't access the site. However this time also makes up most of my dead time each day. I'm sure I'm not the only one in this boat...
So my suggestion is making articles downloadable to your members, because I think being able to save the articles and put them on my nexus tablet would make for a much more productive journey to work!