Thanks for the great suggestions, Charity! A few comments:
We will be removing one of the sponsor banners as it is legacy and essentially a duplicate of another. For those that are in the top right section, we will move to the left banner...
We don't have tracking on the social buttons, but if I were a betting man, I would say they aren't being used that much in the first place...
As for the removing the left panel entirely, that will have to be a bigger decision. In actuality, that is the only constant throughout the site, as often the right column disappears. This might be something we should experiment with on our version of the site...
Thanks for all the feedback, and you are right: Without getting specifics, it is hard for us to figure out exactly what our membership is asking for!