Thanks, Dave. It certainly seems like badging is a growing trend online.
Over the past few years of dScribe at U-M, we've explored multiple incentives for recruiting dScribes including free food, t-shirts, part-time wages (though we don't have the funds to offer that on a large scale), fame and glory on our blog and website, as well as the practical knowledge gained about copyright, privacy, and materials development.
I'm not a big gamer myself and at the moment the only badges I have are fabric ones from my Girl Scout days in my primary school. But I am very intrigued by the use of badges in self-directed, learning environments (like OER) and volunteer efforts, where badges can represent clear milestones for oneself as well as a benchmarks of achievements.
Something as simple as a badge can provide some structure to an otherwise ambiguous or open-ended task in addition to some personal motivation to finish the goals at hand.
-Kathleen