I wonder why Gamersgate are not annoyed by that the same way they are annoyed about Modern Warfare 2?
Because Steamworks is not a DRM, is intrusive as hell, and directly sends customer to a Steam, effectively serving as an in-built ad.
GOO is absolutely transparent; you can use GOO-protected product and know nothing about Impulse.
Basically any game I buy that uses GOO as DRM will show in the client no matter where it is purchased from?
GOO ties your game not to internal Impulse ID, but to your email, AFAIR. If your email is the same for Impulse and GG, it should transport automatically.
Have you already started liking the GOO :-P?