We run bind with no zones on our SA gateway to serve as a DNS cache. Helps take a load off DNS lookups for common hosts. You can easily do this with any other DNS daemon as well. Google for caching nameserver.
If it's a Red Hat system (including Fedora), just install the caching-nameserver RPM. It pulls in BIND and installs appropriate config files. Then edit resolv.conf to point to localhost.
