Moving a DHCP server from one server to another
Here are som nice info on moving DHCP from a Server to another
Sources:
How to move a DHCP database from one server to another in Windows NT 4.0 and in Windows 2000
How to move a DHCP database from a computer that is running Windows NT Server 4.0, Windows 2000, or Windows Server 2003 to a computer that is running Windows Server 2003
Dhcpexim.exe - Tool for exporting database from NT4 or 2000 DHCP