OpenDNS

OpenDNS.com

This is a company that provides fast DNS lookup services. 

"Why do I care?"  you ask ...  Well, you don't really need to care unless, on a regular basis, when you click a bookmark or favorite or type in a web site URL and it takes a long time for the site to start to show in your browser.  What the problem could be is, your ISP (internet service provider) has slow DNS servers.  If you change to OpenDNS they will provide you much faster DNS services and if you type in a URL incorrectly like google.cmo.  then they will automatically fix your spelling and take you to google.com.  also, if you type in domain that doesn't exist, then instead of getting an error, they automatically do a google search for what you typed in and show you the results.

Their site will tell you everything you need to know to make the change or answer any other questions you may have ... like "What is DNS and what does it do?"