Oh WoW! Jagged Alliance, and JA Deadly Games and Jagged Alliance 2, wow long time since I played those............thansk for the recommendations.

Oh and just in case these games where missed:
How about the early Edler Scrolls series like Daggerfall and the ones before that,,,,,,,,,,,those would be awesome additions.
I could include the Wheel of time as well, Americcan McGee`s Alice, Scrapland, Pancer general 1, 2 and 3D.............More will come to mind as I think about them............

They've been mentioned many times in this thread, but I would also like to add that System Shock 1&2 would be great additions to your site.
And Deus Ex as well?

Thought of more games I'd like to see:
Lost Eden
Sanitarium

PLEASE get Activision signed on to this service! They have such an amazing catalog of old PC games that they obviously don't care about anymore. It's clear they have no intention of updating their classics so that they can still be enjoyed on modern computers... In particular, games running on their old Mechwarrior 2 engine, or the Dark Side engine... they simply don't work correctly with modern hardware.
What I wouldn't give to properly play games like Interstate 76 (with the Nitro Pack expansion) and Battlezone (with the Red Odyssey expansion) again... make it happen GOG! And thanks!
And from other publishers, I'd love to get my hands on Rainbow Six (can't run properly on modern systems - I tried recently!) Carmageddon 1 & 2, and Project IGI!

I would really like to see:
Terra Nova
All of the Mechwarrior series
System Shock 1&2
Did I mention Terra Nova?

I almost forgot
Bioforge
I never had as much fun beating someone to death with thier own apendage : )

I would love to see the Mechwarrior and System Shock series come to GOG. Also, I know it would probably be pretty hard to pull off as far as licensing goes but the X-Wing/ Tie Fighter games. Hey, it's a wish list isn't it?

Master of Magic
Master of Orion 1
Master of Orion 2
Alien Legacy

I'd love to see gog.com get Duke Nukem, Blood series, Shadow Warrior

Planecape: Torment
System Shock 2
Baldur's Gate Series
Tomb Raider 1 & 2
Requiem: Avenging Angel
Dark Forces
Commandos (if you can fix the speed bug that makes it unplayable on modern PC's)
I would suggest Deus Ex, but it's already on Steam.

Omikron
Project Eden
Shadow of Destiny (already own)
Still Life (already own)
Syberia series (which I own)
The Longest Journey (own)

Yeah, but GOG would be nice to get Deus Ex DRM-free, without it forcing Steam on you.

X-Wing
TIE Fighter
X-Wing vs. TIE Fighter
System Shock 1 and 2
Sid Meier's Alpha Centauri
Thief