One of the more interesting book anthologies I've come across recently is When the Music's Over, edited by Lewis Shiner. I just received it in the mail today. Put together in 1991, Shiner asked his contributers to write stories where violence was not the solution to solving a problem in a story. In other words the writers were deliberately constrained by the need to write in a non-violent manner.
I'll write a brief review after I finish it.