Paladin Alignment
Since the paladin was first introduced, I have asked: Why are there no paladins of other alignments? Even if they were not called paladins, there needed to be something. In my home game, and I imagine in most home games that create their own setting, holy warriors of different alignments exist.
In 4th edition, D&D finally makes the jump and adds paladins of different alignments. I am happy to see this change.