The Problem:
How to tap into readers ability to select ideas.
The Social Invention:
Theres this interesting movement called social bookmarking. You put down your favorite links and share them with others. One such website is Del.icio.us
A variation of this idea might work for GIB. You can put down your list of favorite GIB ideas with some commentary if you want on each idea.
GIB then has section when people can go to read everyone's personal list of favorites.