What's the difference between this and the normal COP? Is this cheaper as a way to reward users who buy STALKER via Impulse?
-edit- Shoot I have been ninja'd by so many people.

Meh. I like Stalker but not enough to buy it a third time. I'll pass as i'm sure there will be another sale.

You can ask this on Impulse forums or support. They are answering questions very quickly on forums.

No, it looks like any version will do: http://forums.stardock.com/382580

Just to add to that, I remember someone asking GamersGate over Twitter about that loyalty thing too. And GamersGate indicated that they thought the loyalty offer should be available if you have a retail version installed.
Just found the relevant messages which went as follows
Person asking: I have the CD version of STALKER: Shadow of Chernobyl. Will the "loyalty" version of Call of Pripyat on Gamersgate work for me?
GamersGate: Yes the loyalty version should work with the CD-version :)

GetGames Alpha Protocol pre-order (including Space Siege) �24.99/€28.74 here
I don't have to tell you that is considerably cheaper than both GamersGate and Steam.

The UK price is around £24.95 for GamersGate and £24.99 for Steam. But yes, the Euro price is cheaper on GetGames.

Oh, GOD DAMN IT.

That person would be me. ;-)

So it would. I figured I'd play it safe and remove names for privacy =)

The Impulse version of Call of Pripyat Loyalty Edition should work with versions of Stalker Shadow of Chernobyl purchased from retail, or e-tailers such as Diredt2Drive, GamersGate etc.

Steam, Friday's Sega deal:
Football Manager 2010 for $19.99, 50% off
EDIT: Ah, and Sega is bringing old console games to steam, a few Genesis/Mega Drive titles for $2.99.
http://pc.ign.com/articles/109/1091811p1.html

Also : selected Ubisoft games prices slashed....
[url]http://store.steampowered.com/sale/ubisoftpricedrops[/url]

Yay! Time to finally try Splinter Cell!