Elmofongo: Well regarding the my must have list of Importan/Classic/Popular Old School PC games which I have categorized the ones that are FPSes:
Bohemia Library (Thus includes Arma games)
Half-Life 1 and 2
Counter Strike and Condition Zero
Doom 3 and Ressurection of Evil expansion
Battlefield 1942, Vietnam, 2, and 2142
Call of Duty 1+United Offensive
SWAT 4
Hexen series
Heretic Games
Marathon series
Tom Clancy's Rainbow Six 2 and 3 and their expansions
Brother's in Arms Road to Hill 30 and Earned in Blood
Tron 2.0
Red Orchestra 1
Crysis 1+Warhead
No One Lives Forever 1 and 2
Medal of Honor: Pacific Assault
Duke Nukem games
Out of all the ones there the one I want the most is:
(Drum roll)
Crysis 1+ the Warhead stand-alone expansion.
A very good list, my friend. I agree with almost all of them. It would be nice if GOG were a little quicker in fulfilling requests.
Stooner: 1. Serious Sam probably (but there's a few)
2. Soldier of Fortune
Ahh yes, Soldier of Fortune! I would particularly like to see SoF2 on GOG.