1. Heart of Darkness
2. Dungeon Siege 2 Deluxe
3. Homeworld 2
4. Ignition
5. Little Big Adventure 2

1. Thief: The Dark Project
2. System Shock 2
3. Starcraft
4. Thief 2: The Metal Age
5. Diablo

Edit - If I had more choices, I would have gone for Dungeon Keeper and Grim Fandango :)

In no real order:
Grim Fandango
Warlords Battlecry 1 & 2 (they have 3, but not the first 2)
Homeworld
Diablo
Thief

Hmmm...in no particular order:

1. Wizardry 8
2. Shining Force
3. Crusader Kings: Deus Vult
4. SimCity 2000 (would not have thought of this if I hadn't seen another member's mention; great addition)
5. A decent non-driving sports game. ANY decent non-driving sports game.

This is easy.

1.Dungeon Keeper
2.Dungeon Keeper
3.Dungeon Keeper
4.Dungeon Keeper
5.Dungeon Keeper

In no particular order, of the top of my head, and at least somewhat plausible (so no Blizzard games)

1. Grim Fandango
2. Rollercoaster Tycoon series
3. Thief series
4. Dungeon Keeper
5. Colonization

1. Battlezone 2
2. Dawn of War
3. Sid Meier's games
4. Command and Conquer series
5. Ultima Series

1. System Shock 2
2. Thief
3. Thief 2
4. X-Wing/Tie Fighter
5. Syndicate

I mostly chose based on games that are a pain to get running on modern systems.

1. Wing Commander Series
2. Crusader Series
3. Dungeon Keeper Series (or all bullfrog games)
4. System Shock Series
5. Lucasarts Library

yes, I cheated by naming series or publishers.... but one can hope right?

This cropped up in another thread, so here goes:

1. Fantasy World Dizzy
2. Magicland Dizzy
3. Bubble Dizzy
4. Dizzy: Prince of the Yolk Folk
5. The Fantastic Adventures of Dizzy

Worthy mentions to Kwik Snax and Fast Food Dizzy too! I think that covers all the DOS Dizzy games anyway ...

I don't see series as cheating, if they can get one then they should be able to get the other.

Wizardry series
Crusader series
Dungeon Keeper series
System Shock series
Grim Fandango

The Wizardry games range from "More than a new computer" to "Nonexistent" and are ridiculous to get running, even in DOSBox in my experience. (Wizardry 8 is an exception, because I have it and play it. It still costs more than my current computer.) Crusader games are easy to find on Amazon but hard to get playable. Dungeon Keeper 1 is like the Wizardry games and DK2 is like the Crusader games. The remaining titles are in order of how much i like them and that would be best measured in "metric shit-ton" units.

1. Zork Grand Inquisitor
2. The Neverhood
3. Dungeon Keeper
4. Heart of Darkness
5. System Shock 2

In no particular order....

1. Carmageddon 1 and 2
2. Dungeon Keeper 1 and 2
3. Syndicate and its followup
4. Ascendancy
5. Sid Meier's Alpha Centauri

1. Wing Commander IV: The Price of Freedom
2. Vampire the Masquerade: Bloodlines
3. Lands of Lore
4. Legend of Kyrandia 2: Hand of Fate
5. Rebel Assault 2

1. Leisure suite larry *
2. Roller coaster tycoon (first is best)
3. Shogun/Rome - Total War
4. Sam & Max
5 Majestic Chess

Nothing mentioned from those, since it probably will never happen, but worth wishing:
Anything old from blizzard, lost vikings for example, but everything would be great really.
Anything ID, doom, quake, whatever, especially Q3A would be most welcome though.

*I talked to Al Lowe a little while ago, he seemed interested, but not really optimistic.
Please GoG, talk activision it, and get Al involved i'm sure he will be more than excited to donate some bonus stuff or what not.
A remake would be killer - like the monkey island special edition.
Everything larry was pure awesome back then when Al was still involved.
I hope he is cool with me pasting that part, it's for a good cause:

I'd love to see a Silver Anniversary Special Edition come out in 2012 with absolutely everything Larry included. Can I talk Activision into it? I rather doubt it, [...] But I intend to try.

C'mon GoG! It's a piece of gaming history, pure comedy gold and it got a big anniversary coming up.