APOLOGETICS is the discipline devoted to explaining the Christian faith to nonbelievers.
http://www.2001principle.net/ This is easily the most mind-boggling evangelistic site I have ever visited.
http://www.rzim.org/ Ravi is perhaps the most effective explainer of the Christian faith practicing today. He is particularly effective with university students!
http://www.leaderu.com/offices/billcraig/menus/articles.html Dr. Craig is one of the better Christian apologists practicing today.
http://www.crossrds.org/ Useful information here for trying to figure out how to explain the Christian faith to a very bizarre society.
http://www.webcom.com/~ctt/ A very helpful site dealing with Christian apologetics. The philosophy jokes page is hilarious!
http://www.josh.org/ Josh has proven himself over decades on university campuses. Don't judge him by his old stuff--he's learning what works with a new, relativistic generation!
ALTERNATIVE LIFESTYLES AND CHRISTIAN THOUGHT
SCIENCE AND CHRISTIAN THOUGHT
http://www.hisdefense.org/ wide collection of articles by people like Aquinas, Craig, Plantinga, Dembski, Johnson.
POWER TO CHANGE
http://www.powertochange.com/ The Good News of how others have changed, and how you can to!http://www.reasons.org/ This site (under the leadership of Hugh Ross) is devoted to explaining the meshing of modern science with classic Christian thought.http://www.stonewallrevisited.com/ Check out this site!http:www.exodusnorthamerica.org Can same sex relationships fill an inner emptiness?http://www.leaderu.com/ This site has an excellent collection of articles useful for explaining the faith.