Ow, Chris. You bought ArmA 2 already? Just asking as metabolic farked something up and I kinda have 2 ArmA 2's atm.
See, it went like this:
I bought it the first time, downloaded and all, but didnt install it until just before we tried it. During the day, I got an email from paypal that metabolic had refunded the game and I checked and I had 50€ on my paypal account, so they really had refunded it.
So, I went on to install the game, typed the CD key wrong at first, so I though they had disabled the CD key when they refunded the game. So, I bought the game again (this time it was 40€ instead of 50€). To my amazement, I didnt get a new CD key!

Ok, so I went and tried the old CD key again, this time, typing it right and it worked.
Yesterday, I got another email from metabolic WITH a new CD key. So, I'm fairly sure I have two ArmA 2 CD keys just for 40€, because my old arma still seems to work just fine.
EDIT: Ow and the ArmA 1 faces work on ArmA 2, just copy the face.jpg from the Arma other profiles folder thingy to the ArmA 2 other profiles thingy.