Not sure if this has happened to anyone else, but I [somewhat] frequently accidentally hit quote instead of edit, resulting in a double post. And then I don't notice that I hit quote and I have a double post. And some sections don't allow deleting, so I have to edit and say "ignore this post" or something of the sort.
I think moving one of the buttons would help, and having something unmistakable for quoting or editing in the place, so they'll say, "D'oh!" instead of carrying on with their post.
Just something that's been bugging me.