Example?
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Like party NPCs noticing your alignment and reacting accordingly. This can be a simple reaction based on a static alignment, or a dynamic reaction based on a character's alignment changes. Ideally, it should be a combination of both alignment and the PC's actions.
Another example would be to try and firmly establish the notion that an alignment is more than just a title - and is actually the character's morality - by making the character react according to his alignment more often. Someone who is evil likely has very little reason to perform good deeds or make selfless choices, for instance, and this could result in, say, giving him more options based on alignment rather than generic good, evil or neutral choices.