Stumbleupon: The best way to discover great websites, videos, photos, blogs and more.
Lexiconn Internet Services: A hosting company with whom I feel sheltered. They are always available, and they know what they are doing. I've been with them since January 2007. A good friend, who is equally happy with them and equally in dislike of downtime, has been with them a few years. These are the best kind of business people.
Ancient / Classical History, N.S. Gill at About.com.
Taking a Bite out of Books: Free educational materials from a student-run, volunteer-operated website.
FactCheck.org: Spares neither Republicans nor Democrats.
History-forum.com: Well managed and used by good people from around the world.
Wikipedia: A multilingual, web-based, free encyclopedia.