I don't usually do routines as such, but bedtime is the one thing that we are strict about and I'm glad we are, with 3 to put to bed now it could take ages if we didn't have a system.
All times are approximate!
6.15 Bath - all 3 in together
6.30 - start getting them out. Massage, nappies and jammies on.
From now on we have a 'no pretending' rule. Dd1 is always pretending to be someone else (mummy/fairy/unicorn/cat etc and can get silly, so we are 'just ourselves' after the bath.
6.45 - supper. Warm drink, cereal or fruit or yoghurt.
Then clean teeth, toilet, hair brushed etc.
Then up to bed. 2 stories, 2-3 songs, prayers, night night kisses and we leave. At this point dd2 gets her last breastfeed and goes to bed. Dd1 and ds have the light on to 'read' for 15 mins, it goes out at 7.15. And thats them until the morning.
Like others have said, its keeping to it that can be the bother - btu I just do my very very best not to let it slip - no pretending, no racing, no jumping on the bed etc - try to keep it all quiet and subdued,a dn it seems to work. If it does start to get a bit loud, then threatening to lose a story or song works - I probbaly threaten that about once a week, but it is over a month since I have had to carry out the threat, as they know I will do it so it calms stuff down nicely.