I love the Merit Badges over at Strange Magic. As I thought about which ones would apply to me, I found that I had trouble deciding. I think that I try to run each of my campaigns differently. My AD&D 1st edition campagin, for instance, would have an almost entirely different set of badges than the game I ran for the missus and friends last week. I would say that the way I ran Traveller or Pathfinder would also have different badges. I think I'd find them more useful as sort of a "rating system" for a particular campaign, rather than a particular GM's stamp collection. My AD&D1 game was highly tactical, very deadly to PCs, and had both gonzo and disturbing elements. My Savage Worlds game, on the other hand, would be better described as "safe" and focuses more on character development. I think most of us actually have several different styles of GMing that we use depending on the game and the audience.
I can think of a few players I've gamed with over the years who would greatly benefit from the "Run", "Tactics", and "Investigation" badges -or lack thereof- being prominently displayed prior to the start of a campaign.