I'm down with the Baldur's Gate and System Shock crowd. Maybe the first 2 Thief games and perhaps Rainbow Six 1 and Rogue Spear? Not sure how old we're going for but those 2 Rainbow Six games would be a lot of fun to play online again.

Ohh man I cant believe I forgot about Quarantine 1 & 2
I used to play the crap out of the first one (I never played the second one)
I still have the CD but lost the copy protection sheet long ago >:-(

just thought of another one id like to see: Wages of War...
and i second the Heavy Gear requests...

Pool of Radiance: Ruins of Myth Drannor
It can still be installed and run under XP and VISTA but there are horrible graphic glitches.
Id buy it again from GOG if they could fix it but if anyone knows a trick that fixes the messed up gfx that would be even better.

Isn't that the RPG that inspires unparalleled levels of hatred from all reviewers?

I dunno. It could be.
I never read a review for it. I bought it from the discount bin at a computer store a few years ago and have never been able to really play it because the messed up graphics are too disruptive.

I.G.I.
I.G.I. 2

I forgot !!!
Sanitarium !!!!

as a note to everyone who has mentioned deus ex and it's sequel, they are still available - on steam.
(not sure if mentioning them gets a lad stoned here or what, but they sell them. its where i bought mine after a particularly nasty house-move that lost many, many cd-roms in it's process.)

How did I miss this topic? Anyways I got quite a few games I would LOVE to see again...
Raven
Heretic
Hexen
Hexen II
Heretic II
id
Doom
Doom II
Quake
Quake II
3d Realms
Shadow Warrior
Duke Nukem 3d
Monolith
Blood
Blood II
Looking Glass Studios
System Shock
System Shock II
I have wanted to play the system shocks forever and the other games are timeless to me.

As well as Thief 1 & 2, System Shock 1 & 2, I would like to see,
Crusader: No Remorse
Crusader: No Regret
BioForge
Ultima Series (Especially 7, 7 pt2, 8 & 9)
Wing Commander Series
Privateer Series
Little Big Adventure 1 & 2 (Relentless 1 & 2 in the USA)
Gabriel Knight Series
I'm sure there is a load more but they slip my mind...

Rise of the Triad
DRUNKEN MISSILES FOR THE WIN!!!

Lot's of games here are still on sale elsewhere. All the X-Com games have just been made available on Steam for example. Every time we find out a game is available elsewhere we know two things: 1) it will cost us more than $5.99 and 2) We will be expected to do all the legwork to get the game to work on our modern PC's!
If a game isn't available elsewhere we can only hope that G.O.G gets it first - it'll be cheaper and easier for us that way!! :)

hahaha. i installed + played ROTT (in DOSbox) earlier this year while on a nostalgia kick.
the whole john woo double pistol thing had not lost its win.
such a great game.

How about Terminal Velocity (hi res CD version) ,
Omikron The Nomad Soul,
The No One Lives Forever series,
or Heavy Metal F.A.K.K. 2
I know these last few are less than ten years old but have proved to be very elusive to find.