I'm not a strict routine person, but DH and I have always found that having a regular bedtime and bath/milk/story routine helps to settle our DS (now 3) for the night. We go up for his bath about 6:30 and he's usually askeep by 7:30. He does still wake up in the night a few times a week but the start of the night is reasonably reliable.
DD is only 9 weeks old, so any kind of routine for any point of the day seems like a long way away at the moment, but we want to fit her in to the bedtime routine as soon as we can. However, everything seems a bit frantic at bedtime now with two of them to sort out so I was wondering what other MNers do.