Just go back a page or two, plenty of posts about it.
Or get it off Green Man Gaming for £18.75 using their 25% off voucher which is a Steam key and no waiting for the retail product to turn up in the post.
http://www.greenmangaming.com/s/gb/en/pc/games/action/dark-souls-prepare-die-edition/
GMG25-UAAHK-6AI9S
Info on if the retail key registers on Steam is conflicting, so without someone where who has purchased a retail copy letting us know it is hard to be certain.
thanks Speed - thats a good deal on greenman - will go for that
I have Dark Souls on PS3 - but find it very frustrating - but then I find most gaming on a big screen (even with a decent 7.1 sound system) frustrating - somehow I feel removed from the action sitting a distance from the screen
wheras on PC I feel more engrossed with the monitor right in front of me