The DCHP-DNS integration is certainly not new, though security has to be tight in this scenario. If you are running W2k server with DHCP and DNS, you can easily have DHCP update the DNS database by checking a box. I don't recall where exactly, but it's in Computer Management. More fun is the integration of DHCP, DNS AND WINS. I've done some research about integration of these technologies in the past, though I've never actually build an infrastructure that relies on them, sorry.