How best to use WSJ and Economist?

A lot of people on this and other forums suggest test takers to read WSJ and Economist to improve RC and SC. But what exactly should I be focusing on in these news papers. What should I read to get the best Return on investment of my time? Are certain sections\columns\authors better than others for GMAT prep.

Also, are there certain strategies that I should use while reading these papers. For example, someone on the forum said I should try to find the conclusion/argument of the passage. Are there other strategies that I should use while reading this material. What I do not understand is how will reading articles improve my SC (I am assuming there are hardly any errors in these papers or am I giving them too much credit?)

I request the experts to give some (detailed if possible) direction in this regard. It will help me and a lot of other test takers like me who are struggling with the verbal section.

Thanks for your help.
Vijay