I believe so.
It certainly works in UK.

GreenManGaming has a nice promo. 3 for $8 or 2 for $15.
Annoying that Fallout NV Ultimate edition is not available in my region :(
I wonder if the keys are region-locked, because through a German VPN it seems that I can add them. Though germany has some weird laws and I wouldn't want to have a dumbed down game because of this.

Teleglitch: Die More Edition is 75% off. Steam key on GMG and GG.

Around $3.25 / 3.25 Euro / 2.25 Pound.

http://www.gamersgate.co.uk/DD-TELEGLITCH/teleglitch-die-more-edition

Anyone know if there is an active 20% off voucher on GMG right now?

No active 20% that I could find.

GMG25-J2566-L2GHZ voucher for 25% off.

Also a Far Cry Series sale at GMG right now.

Unfortunately, this one works only for pre-orders and a couple of new games.
Eh, will have to wait a day or two and they will surely create a new 20% off voucher.
I will wait patiently for my $0,65 off the top!

When I used the code I purchased from Amazon on Steam it registered as "XCOM - EU" and is fine. Am I'm Australia, which hasn't been part of Europe since we emancipated ourselves from England at Federation :P

EU = Enemy Unknown :D

and this one:
GMG20-GNQYR-URU7M

just came in the email...
but can also be possible be only for the Ubisoft sales, I did not try:

http://www.greenmangaming.com/far-cry-titles/?emst=WQ77HvpazT_200554_208307_393

Far Cry 3 / DLX/ Upgrade / Blood Dragon 50%

haha der, thanks for pointing that out. In my defense, I hadnt slept when I used the code :)

I believe it works both ways, really :)
Their Evil Regional Blocking Software didn't detect you as any of the known enemies, so the let you pass, and activate the game.

I tried it for Teleglitch and it didn't work, then tried for Farcry and it didn't work either.
Maybe it's too fresh and not yet active...

Edit; Scratch that, I copied the code without the 'M' there at the end :D
It actually works for Farcries, doesn't work for Teleglitch :(
They went crazy with these vouchers, a separate one for everything...

I just bought mine through Steam with the last card sales.Another free game? don't mind if I do :)

haha!

Oh look, all the games are regionlocked for me. Assholes.

I would like to recomend Leviathan 6$
http://notonsteam.com/#post-197

Anybody knows
The Yawhg?
http://notonsteam.com/#post-59

or maybe
Ku: Shroud of the Morrigan
http://notonsteam.com/#post-491