Except for the area idea, that would make hunting very difficult.

But I would also advocate that goodies and evils should be able to group together and there should be less class given alignment checking abilities, and even less gear that gives away a characters alignment.

Everyone knows a paladin is a goodie and a duergar is evil, but alarge number of races and classes do impose alignment/ethos restrictions, I would think it would be fun to use that avenue for further RP then make it relatively meaningless by allowing most people to know within moments if a character is good or evil.