GODzillaGSPB: What I don't get: What does the GOG-version offer what's not already part of the "Collectors Editon"? Or does the OP confuse CE and "Premium Edition"?
As far as I can see the CE actually has even more content. The coin, the dice set, the bust. Plus everything that's digitally in the GOG version is nicely printed in the CE.
Okay, there are the "bonus videos" in the GOG version. But that's simply a collection of all the videos that are floating around at gametrailers.com or even thewitcher.com. Just get them there (you can download them at gametrailers.com). And the one explaining the political situation is missing even.
The "Game Guide"...I'm not sure, but it might not be in the CE. However, it's not really a walkthrough. Everything you can read there you can get on the internet, for instance at
http://witcher.wikia.com/wiki/Witcher_Wiki .
So...much ado about nothing in my opinion. ;)
The Game Guide is included in the CE.
What the CE is missing, is a couple of papercrafts (you get the normal PE ones (= Geralt + random) plus the Draug - so you lack all the 'random' papercrafts but one), some bonus tracks (3?) from the soundtrack and, apparently, a couple of wallpapers and avatars. That's it, I think.
So, it's more like 'much ado about little'. :p