That's a good point Eric. I hadn't really thought of that. I was thinking that if our server's IP address ever needed to be changed, then I'd have to go back to register.com and manually change the IP address of the 60+ domain names we own.

Do you know if there is a performance hit (on our server) if the 60+ domain names were set to our DNS server (which is on the same physical server that runs our websites, email server, etc)?