A very good Catholic Apologetics group run by lay people. It's head is Karl Keating, a very intelligent and rational writer. You can find them online at www.catholic.com, or by snail mail at Catholic Answers, 2020 Gillespie Way, El Cajon, CA 92020. Their tracts are well refrenced and fall in line with the doctrine of the Catholic Church (in other words, they're saying what the offical position of the Church is, not what they think it should be like some other groups do...).