OpenDNS + DD-WRT - powered router
We use OpenDNS for general content filtering, enforced at the router level, plus the restrictions afforded by DD-WRT router firmware allow setting time-access restrictions and P2P protocol and website URL/keyword blocking on a per-client MAC address basis. Problem solved! (at least while the kids are at home, unless they can hitchhike on a neighbor's WiFi, or...)
Biting the hand that feeds IT
