At least this is one debate we don't have in Britain. With right-angle plugs being the norm, there's only one possible orientation which is considered correct:

[Linked Image from tlc-direct.co.uk]

Notice that our ground is up though, versus the Australian/New Zealand down. This is due entirely to the fact that we're on the opposite side of the world and are thus "upside down" of course! [Linked Image]

Sorry, couldn't resist that one..... [Linked Image]