I added the "Karma" function of SMF, just renamed it. Just to be a curmudgeon, I've totally flipped on its head the way it works.
A bogometer measures bogosity in milliGels (I'm trying to see if I can stick mGel after the number). Higher numbers are more bogus. So, completely contrary to the way Karma is set up to work, saying that a post is "cool" decreases the number and saying it's "BO-GUS" increases it. So higher numbers are worse, not better.