I asked this question about transporting twins a few weeks back. The original thrust of the question was how to transport twins without a trailer. There are several good answers for both putting kids on the bike and in a trailer (which is changing my opinion on using a trailer).
I think now that it would be better to change the question to ask a general 'how to transport twins' - i.e. convert the question to match the answers. And I think this because it would make the question more useful to a broader range of people.
Is it OK to do this ? I've made it a CW question, so anyone can change it.