OpenDNS theoretically helps speed up Web browsing by using better DNS servers to resolves URLs faster than your Internet Service Provider (ISP). The increase is probably too small for you to notice on a regular basis, however. More importantly, the service gives you better control over the Web sites you and your family visits, and contains built-in controls to protect against hackers hijacking your brower.In operation for just over two years, OpenDNS now is serving upwards of seven billion DNS queries per day. I've never experienced an outage or performance problem. Kudos to the folks at OpenDNS for running a fine service.
→ See also - What Is a DNS Server?