I think the idea's really neat, but at the same time I'm concerned about the effect that things like this have on the attitude of our culture. A large part of critical reading is being able to take the time to read an article/passage in-depth and judge its ideas for yourself.

From a business standpoint, are there maybe certain types of content that just aren't viable to "summarize?" Would it be better to tailor your service towards certain other types of content? Just my thoughts.