Lee Strobel - A case for Faith - Lee is a worderful writer. Also a reformed Athiest. His books and videos are very well done.
Rick Warren - Purpose Driven Life - Rick is an amazing speaker. His Saddleback church now has over 20,000 attendies a week. His book has sold over 20 million copies. Number 2, behind the Bible.
Peacemonger.org - The bumper sticker people.
Ethic of reciprocity - Wikipedia article about the history of the Golden Rule.