In reviewing options for Web filtering, activity logging, and controls — this InfoWorld story mentions that OpenDNS can speed up the resolution of website URLs into IP addresses for a faster online experience.
“Just to take a step back for those readers who aren’t already DNS experts, the process essentially works in much the same way that you obtain a phone number for a person you know. You can use a phone book or call a service and provide the name of the person (along with his or her address, perhaps) and you receive the number in return. With Web surfing, a DNS root server takes your URL for the website you want to visit and locates the IP address of the servers hosting that website. The browser then connects to that IP address.”