Nominally, the traditional 9-point system. Essentially none.
I'm happy that alignment in 4E has no mechanical impact on the game. I don't know what alignment the PC's in my game are, and I don't really care. I tend to think of NPC's in terms of the good/evil and law/chaos axes, and there's a fair amount of law/chaos tension in campaign, but it's all flavor and no crunch.
Which is fine by me.