coldfusion is the most popular tag of them all, but they are all the same thing and there aren't very many questions associated with them.
It looks like they were all created by the same user, too. SO's tag wikis seem to suggest that coldfusion and cfml are not quite similar. If they are, then someone else can change them.
For now, I've retagged the coldfusion-10 question with coldfusion, and the former will die soon.
UPDATE: That question has been retagged by the OP with this reason.