I'm sure there are a few around. 
Do you mean with regards to our own gamification projects, or doing so more directly on focused problems? Foldit is a great example of the later, the real-life problem of molecular folding has been turned into a competitive game (http://fold.it/portal/info/science)
I personally am usually really tired of being in front of a computer by the end of the day, so spend very little time playing MMOs or even standalone video games.
There are other flavors of game playing, though. I do enjoy playing modern boardgames with friends (if you are thinking "Risk" and "Monopoly" when I say that, you are sadly behind the times, check out the wide variety of games at www.boardgamegeek.com - games I frequently play include Puerto Rico, Pirate's Cove, RoboRally, Small World, Age Of Renaissance,, Seven Wonders, ... really far too many to list. ). I also enjoy live action roleplaying (LARP).
I think game players of all types will generally do well with gamification.
-bret