It would be great to have the DHCP Server update a DNS server Specified in the DHCP Server config.
This is especially handy for Active Directory and resolving branch office computer and device names.
Here is a guide I wrote a while back for OpenBSD, I was using BIND as the DNS, but It can easily be switched and applied to Windows DNS server
http://www.bsdguides.org/2005/active-di ... -dns-dhcp/