About a month ago, my family heard Mark Cahill speak at church and his message was awesome!!
Mark is a former basketball player who played his college ball at Auburn and was teammates with Charles Barkley. After getting his degree in Business and working in the field for a while the Lord called him out and he began his journey of sharing his faith and summoning the people of God to do the same.
His mission is to witness to the unsaved through "conversation not a presentation". He says "every second, two people die. Do you care? If so, do you care enough to do something about it?"
He's written two books, "One Thing You Can't Do In Heaven" and "One Heartbeat Away". I have read the first book and it has changed the way I think about witnessing to the unsaved, drastically! Go to his website to see video of him speaking and order his books and DVD's. Let him challenge you to change somebody's eternity!