The worlds oldest Masonic web-site is A Page About Freemasonry. It was established in October 1994, by Bro. Gary L.Dryfoos, from Massachusetts.
It's a perfect place for a non-member to learn the basics about The Craft, but also an extensive source of information and contacts for members and researchers.
One of my favorite features on this web-site is the Letters page, where very curious questions are answered every month.
Also, make sure to visit the Guest Book, and check the Correspondence Requests, as well as the Essays, Articles and Questions page for more in-depth information.