I think the Australian plug is great, with the only caveat that it would be basically perfect if the pins were just slightly thicker (they're just a little bit

I think the Australian plug is great, with the only caveat that it would be basically perfect if the pins were just slightly thicker (they're just a little bit too easy to bend). It's fairly compact, sockets always have ground, you can't plug it in upside down and swap live/neuteral with the two pin version (used for double insulated equipment), and it has a sensible scheme for 10, 15 and 20 amp sockets (the ground pin is bigger for 15 amps and all the pins bigger for 20 (I think) so you can plug a 10 amp plug into anything but can't put a 15 amp plug in a 10 amp socket or a 20 amp in a 15 amp socket).