chain Argos made an online administration error and some of its cutomers could pick up their copy of Halo 3 yesterday. The snafu has since been corrected and if you haven't already gotten your copy, don't expect to be able to pick one up now.
Pro-G. a UK gaming website managed to get their hands on a copy of the highly anticipated game and so did aparently quite a few UK gamers.
There was a rumour that Microsoft would ban people's Xbox Live accounts if they were found playing Halo 3 online, but Microsoft has made a statement saying that this isn't the case.
You can check out some more details about this major screwup over at Pro-G