Once you've signed up, use this code at checkout: READY-UPDEA-ISLAN
It's a Steamworks game, so they send you the activation code immediately afterwards so you can activate it on Steam. I pre-loaded mine last night. Oh and cos you're signing up through me, they also give you £5 off future purchases you make too....
... which is where you buy Arkham City for £15, by using the code 20SUM-MERSA-VINGS and the £5 credit you get for signing up / buying Dead Island!
I just use Paypal (though all the debit/credit cards are accepted) and you can sign up from anywhere in EU/USA etc and they just convert the savings to your currency. Seriously, GMG is pissing all over Steam at the moment for good deals. Oh and if you don't think it's legit, there's a whole 10 page thread on the Steam forums here from people who've bought it from there. Great site
