So I've ordered a copy of the collectors edition as well as the one through GOG, my question is just whether cd-keys are interchageable, ie, if I pre-download the GOG.com version so I can play before the collectors edition gets here (shipping will take a week) can I use the collectors edition cd-key with it when it arrives or are they two seperate installs?

If I have to wait till my collectors version gets here that's ok, but afaik all the extra content keys are separate and amazon will email them on release, hence I could play the GOG version with the collecters version additions a week early :)

Thanks :) Sorry I guess I should have talked to them first ... thanks for this :)

Hope I'm not being impatient, was just wondering if there had been any word on this.

Weird, I received an email with the code yesterday - not from Amazon, but still.