OpenDNS provides domain names systems (DNS) support to turn your site's URLs into Web pages that people can navigate to. The process of converting a domain into a machine-readable address requires services like OpenDNS, which happens to do all of this for free. In many ways, it's the middleman of taking a domain you buy off of a domain service and hooking it up to where the data is actually hosted.
OpenDNS also lets IT admins get a very high level of control over sites and services its users are trying to access including domain blocking, whitelisting, and content filtering. It's used in colleges, high schools, and businesses for these reasons.
Winner: OpenDNS (OpenDNS.com)