I want to see Command and Conquer: Red Alert, the Win95 version. NOT the GDI vs NOD, the Soviets vs Allies.
some people get those confused for some reason...
RANDOM MAMMOTH TANK

Commander Keen(all Games)
Hocus pocus(spell wrong i think)
Wing Commander( all games)
Doom( all games)
Ultima underworld (1,2,)
System shock (all games)
Kings quest (all games)
7th guest
11th hour
And many many many more that are out there

Bioforge;
LucasArts library;
Doom;
Alone in the Dark (1992) -- don't necessarily care for the two immediate sequels;
Lost Eden;
Psycho Pinball;
The one on the "what's this game" thread that I unfortunately cannot mention.
Edit:
I agree on 7th Guest and 11th Hour too. Ugh, there are just way too many games to mention that aren't on here yet.

Supreme Snowboarding

Crusader: No Remorse
Crusader: No Regret

heres a few more game i like to see here
Duke Nukem (1,2, side scrolling)
Number Munchers
The Black Calderon
X-Com
Warcraft (1,2 exps)
Alone In The Dark (1,2)
Wacky Wheels
Raptor
Garfield: Attack of the Mutant Lasagna
Space Quest
Police Quest (all games)
GTA (1,2 london1969)
And still many many more

System Shock 1 + 2
Sam & Max Hit The Road
Neither of these games are on steam. Everyone regards these as classics, and I'd love to try them.

GTA 1 & 2 are given away by rockstar on their site, I believe.

Hell Yes! I so want to play Raptor again, that game was sooooo awesome. Tyrian was ok but Raptor that game was the best.

But with the gog installer and some nice extras it would be fine as a free game on gog

darkstone. it doesn't work on xp, and i heard it does ok on vista. but i think the dev and publishers are defunct.

Just updating the list due top 10 in no order( thick printed are favourites):

Prince of Persia: Warrior Within
Prince of Persia by Jordan Mechner
Prince of Persia 2: Shadow of the flame
Prince of Persia 3D
Magic Carpet
Devil May Cry 3: Special Edition
Resident Evil
Resident Evil 2
Resident Evil 3
Resident Evil 4
Silent Hill
Silent Hill 2
Silent Hill 3
Silent Hill 4
Parasite Eve
Parasite Eve 2(I heard both were released on PC)
Metal Gear Solid
Metal Gear Solid 2: Sons of Liberties
American Mcgee's Alice
Cyrostasis
Vivisector: Beast Within
Cold Fear
Dino Crisis
Dino Crisis 2
chaos legion
Jade Empire
Fallout 3
Loom and other old Lucasart games
Sam and Max (98-release)
Penumbra Trilogy
S.T.A.L.K.E.R. Shadow of Chernobyl
Sniper Elite
Splinter Cell
Splinter Cell: Pandora Tomorrow
Splinter Cell: Chaos Theory
Rayman(all of them >_<)
Tomb Raider: Anniversary
Tomb Raider: Legend
other Tomb Raiders(they're all the same)
Alien Shooter
Alien Shooter 2
Zombie Shooter
Zombie Shooter 2
Just Cause
Braid
Orange Box (lul, I trolled u)
Doom trilogy
Bionic Commando: ReArmed
Dead Space
Mirror's Edge(so that GoG can make it playable on PC)
Hitman
Hitman 2: Silent Assassin
Vampire: the Masquerade - Bloodlines
Thief: The Dark Project
Thief 2: The Metal Age
Thief 3: Deadly Shadows
Toonstruck
Silver
Just Cause
Saints Row 2
Aquaria
Blood
Full Throttle
Gods
Grim Fandango
Heart Of Darkness
Maniac Mansion
MAX PAYNE
MAY PAYNE 2
No One Lives Forever
Nox
Omikron
Pathologic
Call of Cthulhu: Dark corners of the world
Quake 1,2,3
The Chronicles of Riddick: Escape from Butcher Bay
The motherfucking WITCHER

I'd love to be able to play Missionforce: Cyberstorm again

YES PLEASE BRING ME CARMAGEDDON!!!
Psst: I made an account just to beg for Carmageddon!! LOL

HAHAHAHA
Tell your friends to do the same.
:D
We need more votes for it.
BTW:
DID you vote for it?
If you didnt, head to:
http://www.gog.com/en/wanted/
Search, and vote.

That's a really great site, but it really lacks Incubation (very nice tactical turn-based strategy). ^_^