From one of my favorite ministries: "STR has a new feature - a 14-week series of short lessons on 'Tactics in Defending the Faith' that will be delivered to your email inbox. It's a free and practical resource from STR's most popular topic."
Be on the lookout this September for Greg Koukl's new book, Tactics: A Game Plan for Discussing Your Christian Convictions (Zondervan). Koukl is not only a great thinker, but also a wise and winsome communicator.
Check out a number of videos of him answering objections to the faith on YouTube.