Wow, a couple of really one-eyed Kiwis on here (a couple, not all!) - what Hore did was despicable - it wasn't anything to do with clearing out at a ruck, it was a swinging arm at the head of a 6'6" second row who had his back turned. Whether Hore has done something like this in the past or not is irrelevant - everyone has a "first time" and it doesn't excuse the act.
It's a shame that, even though he will get a ban, it won't hurt his team like a red card on the day would. It's time the rule in the English Prem is rolled out across the board: ref's can go to the TMO for foul play incidents that they've missed at the time. It would have been a straight red that would likely have changed the game significantly (although I still think that NZ would have won - Wales were dreadful)