The American Humanist Association is starting a new campaign to increase awareness of reasonable values: Consider Humanism. They have adds that contrast Christian sentiments with humanist ideals, like this one:
Probably too shrill and militant, huh? I swear, I heard the horses whinny and stampede at that voice, and I don’t know how I’m going to clean up all the saliva and blood splattered all over the inside of my video display after playing that.
Actually, I think it strikes a nice balance of calmly pointing out the ugliness of religious dogma, while also presenting the positive ideas that drive freethought. They are looking for donations — this is not cheap — to get the ads on TV stations, and they also have some nice printable versions.