Well, I have a dual core Athlon XP 5600, 2gb DDR2 6400 ram, 8600gt Nvidia card with Realtek 7.1 onboard sound and the game runs fine

I have never heard of Quarantine and Google has never heard of it either, so I cannot see how it is a classic, and despite probably getting flamed, some of the titles mentioned are never going to be on G.O.G. because while being good games in many cases, they were never in the classic class!

The old Lucas Arts adventure games would be nice to get. Its so hard to find a copy of Grimm Fandango anymore. Day of the Tentacle would be an awesome addition as well.

I didn't know you where a computer game Guru. It must be quite an honor being able to declare what games are worthy to be hosted here on GOG simply because you never heard of them.
After all if you never played it then it simply must NOT be good. Right.
http://en.wikipedia.org/wiki/Quarantine_(game)

Googling "Quarantine PC game", gets me 210,000 hits, so, not quite sure whats wrong with your Google. A quick trip to mobygames, would tell you, just like in my original link.
And GOG stands for Good Old Games, NOT Classic Old Games, quite a difference. There are already a few games on sale that weren't regarded as classics, simply because they were overlooked, underrated and long forgotten back in their time.

I would love to see a Winxp/Vista version of TIE Fighter.
Freespace is better series, but I loved TIE back in the day.

Sure it's been mentioned before, but -
Planescape Torment
Baldur's Gate series
Icewind Dale
Gog has said it still has a few surprises up their sleeves... please please bring us some of the greatest PC RPG's of all time ;)

Ok, I just remembered two more. And the chances of actually getting these two are pretty slim, but here goes
Final Fantasy VII
Final Fantasy VIII
:) Told ya, they were tough ones :D

I thought of two more as well -
Divine Divinity
Beyond Divinity
Would be a great push for gog as well since there is a new Divinity game due out sometime in 2009 ;) I own Divine Divinity, but would gladly pay for a futureproof version. And IIRC, Beyond Divinity had Starforce, so a DRM free version would be much appreciated.

Yeah, I second this. I've always wanted to play Full Throttle.

As others have already suggested, and maybe some that haven't been (I didn't get to read all posts yet) :
X-Wing -vs- Tie Fighter
7th Guest
Alpha Centauri w/ expansion
Thief series
Wing Commander series
Total Annihilation w/ expansions
Beyond Good & Evil (yes, I know it's on Steam now, but it doesn't like to run properly at my monitor's standard resolution of 1280x1024)
Eye of the Beholder series
and especially these:
Mechwarrior games
Worms series (since Codemasters already has games on here it shouldn't be too hard I hope to get these)
Motocross Madness 2

If I could give you some advice you might want to just track down used PlayStation versions of those games.
There are 2 good reasons why
1) They are way easier to find than the Pc versions (and you wont have to wait for GOG)
2) Playing the PlayStation versions on a Pc with an emulator makes the games look amazing if you know how to configure the GFX plugins.
Take it from someone who knows.

I'll sign with my own blood and give my soul for Planescape Torment.
$5.99 will be perfect also.

How about a version of Crimson Skies that will work on newer Nvidia cards. It has something to do with a divide by 2 Jpeg compression error or something like that that any newer Nvidia card cannot handle. The funny thing is that even brand new ATI cards can still play this game. I own the game but in order to play it I have to resort to the built in Geforce FX5200. Alien versus predater had this same issue but at least Nvidia and the developer worked the issues out and the game can now be played on newer video cards.