MetroDad has a hilarious post up called The Eight Types of Playground Parents, in which he details the stereotypical behavior of The Executive Dad, The Peter Pan Dad and the Crazy PTA Mom, among others. As many of the comments have pointed out, he only forgot one major group--the vegan/anti-vaccination/LLL moms.
My husband spends a lot more time at the playground than I do, so I'll have to see how accurate he thinks these personas are. I suspect the female stereotypes aren't as accurate away from the coasts. Midwesterners are just a lot more chill. But I think the male stereotypes are right on target. And I I'm going to go ahead and say that Josh is about equally divided between Hipster Dad, Peter Pan Dad and The Hoverer.