When I saw this comment to my last post by Jeffrey Cufaude, it was too good not to pull out and put in its own post. I would add that there should be something like this on the evaluation forms as well.
I wish we could do this for our magazines, except they're already free. I do have a pretty good library of meeting planning books I could give away for ideas worth implementing—would that work? I'd love to give this a try.