DNS: OpenDNS Offers DNS Vulnerability Protection
OpenDNS is an excellent and free dns server with customizable protection levels. it is good for home users up to network administrators. it ranges from plug and play to custom protection against spam, fishing and domain hijacking. Now one more reason to use openDNS is the recent vaulnerability found to infect many DNS servers that are not patched against the worm. Try it. it is free.