The status of consumer rate-limiting?

I'm interested in an informal poll of consumer ISP's regarding application rate-limiting. For all you folks out there managing "broadband" networks to residential end-users: Are you controlling peer-to-peer traffic in some way (i.e. rate-limiting, blocking, etc)? Do you have plans to control peer-to-peer traffic? If you don't mind, can you generally describe how you have implemented any limits and how effective those solutions are? Are you imposing other total traffic download/upload limits? Are your limits imposed via "policy" (nag your abusers) or via "network" (they get blocked automatically)? Thanks! ~Curt PCS: (913) 219-8342