I also have seen a need for this. And as long as we're in the "if you don't ask, you never get" mode, along with the individual check boxes, I'd like to see a "check all" and a "clear all" pair of buttons.
If that is feasable, could it be included on the newest nodes page, also? There are times when I don't have time to go through all of the newest nodes and they start to pile up. If I could check off the ones I'd read, there would be a shorter list for next time.
(so many nodes and so little time ... )