This free software I found today improved my browsing speed by a noticeable amount. According to the website, it works on Windows, Mac, and other UNIX based platforms. http://code.google.com/p/namebench/ It will compare your current DNS servers to freely available alternatives--like googles new DNS service, openDNS, ultraDNS, etc. My own benchmark indicated I'd get a 47% improvement if I switched to OpenDNS, and gave me a list of IP addresses for the three fastest IP addresses to use as my DNS servers.
My own benchmark indicated I'd get a 47% improvement if I switched to OpenDNS, and gave me a list of IP addresses for the three fastest IP addresses to use as my DNS servers.