http://en.wikipedia.org/wiki/Merit_badge_%28Boy_Scouts_of_America%29#List_of_current_merit_badges

I might go back and "earn" all the merit badges I don't already have. I already have 30+, which is enough for about a gold Eagle palm; there are about 100 total. I probably couldn't officially earn them, but I could look at all the books and/or teach them.