Started a wind-down routine at 2 months, continued with it until... actually, it's on-going, he's REALLY calm in his cot but won't sleep. He has a really positive bedtime and is laughing all the way to the bed (seriously... I can't stop that because he's so happy about everything... why? How is playing peek-a-boo with the wall fun?) but talking about his day and reminding him how to go to sleep doesn't work for us.

Egads, I wish there were a wonder-one-size-fits-all-fix! But thanks for sharing and as you say, this way does mean positive bedtime associations and DS loves his bedtime.