In "One Unit Whole Blood" box there was a disc "GameWizards Guide for Blood" which was originally a part of a CD-Rom & GuideBook set. Not sure about the book though, it sure was missing from my OUWB box :( Any chance of seeing it as a bonus content here? Maybe together with PDF version of GameWizards book?

GameWizards? Never heard of this, is it a company of game guides?
If yes, then GOG may need to contact them and have the rights to distribute it...

Well it sure used to be. Not sure about nowadays. The full info goes like this:
Title: Unlock the Secrets - Interactive Game Wizard for Blood
Author: GameWizards
Distributor: WizardWorks
Media: CD-ROM
It's quite nice with Victoria Wolfe as your guide :D You can check it out on youtube. I was just curious since, you know, GOG calls this release "One Unit Whole Blood" if it's going to be anything like the original O.U.W.B retail box that contained Unlock The Secrets CD-ROM.

Yes, the GameWIzards Guide is a part of the One Unit Whole Blood when you got a retail copy of it.
Get permission from GoG and I'll upload a CD image of this.

Hmm Interesting. WizardWorks was acquired by GT, then Infogrames, then Atari. But I've never heard of this GameWizards, if it was another company or just a division of WizardWorks.
There's a guy on youtube with this content:
http://www.youtube.com/user/Cachibache88

Game Wizards was a small company pretty much did nothing but interactive game guides on CD ROM. They never were that sucessful.people preferred printed guides..probably because they were easier to refer to while playing then having to stop the game, put in the Gameizards CD, and then start the game again.

Peter, I had the same question, but it looks like not, since you asked like 10 years ago. Did you ever find the strategy guide anywhere? I have searched and have not found it. Even Amazon lists it, but it is out of print, so I can't seem to buy it. It would be nice to find a pdf of it.

I read on wiki that there was a second strategy guide as well (not included in any games). I saw a "new in box" version of that one on ebay for $20.. It says it is "interactive", not sure how good it is...