I preordered a Wii a few days after Argos started offering it for pre-order (mid October). I received a phone call today from Argos letting me know that they don't have enough Wii's from Nintendo and I won't be getting one at launch.
However I know people who ordered from Argos a month later and they are getting their console on Friday. It appears Argos have completely messed up here and not allocated consoles on a first come first served basis as they should have. On top of this customer services blamed it on Nintendo and Argos make you pay the full cost of the console when ordering!
Good luck to the rest of you lot in getting yours!