Divine Divinity would fit right in here....

Betrayal at Krondor -- Wonderful game that I didn't get a chance to finish, and now I can't get it to run.
Caesar 3 -- The latest iteration, number 4, just didn't have the charm that 3 had.
Imperialism -- Build your nation until all the other nations elect you governor of the 19th century world! It won't install under Vista.
Heros of Might and Magic 2 Gold -- Whenever someone insists that realistic graphics are a necessity, I think of this game's vibrant, 2D art. It's like playing a stained-glass window.

Dungeon Hack
It was the first (that I know of) commercial 3d roguelike. Yes it came before Diablo.
It would be nice to see it here.,

Another vote for X-com.
And wouldn't mind seeing the Realms of Arkania series - Blade of Destinty, Star Trail and Shadows Over Riva.

Another vote for the game called Gender Wars!

I really, REALLY want the Syndicate Series to be added. That game was awesome, and I used to play it for hours as a kid. I still have the original disk, but it's just impossible to run on Vista. Vista Support just does so much for me, and the main reason why I like GOG so much
It makes me kinda sad that Syndicate, along with some other games like TIE Fighter, are just buried by games that came out like 3 weeks ago, or games that haven't even been released on PC's (Ie. Chrono Trigger, Goldeneye)
There should be better sorting systems on the list such as Alphabetical, and Most Voted, or increase the most voted list to 25 or something. Not to mention, remove games that just plain don't belong on the list

You are not the first to ask for this. So far GOG hasn't looked at the wishlist functionality because they were focusing on the recent site update (which did not include the wishlist), but they've said that they would look at it after new years eve. Which would be... now, I guess :-D

Baldur's Gate 1&2 + Expansions, Icewind Dale Series, Neverwinter Nights Series.
It's been said before, but I wanna bump these games again, I think there'd be a lot of downloading going on if these games made it to GOG.
Go vote for them if you already haven't!

It would be great if you guys could work some magin on Udoiana Raunes games - http://www.udoianaraunes.de/
They are freeware games, but they don't work properly in Vista. The action commands don't work when you click on them, so you can't pick up, talk, or use anything.

Phantasmagoria!

I would love to see Freelancer on here! Coolest space sim I have ever played, plus we don't have enough sci-fi-ish games in here hehe..

Considering GOG has two Bioware developed games and a slew of Interplay games those series might not be as far away as they seem. I don't know when they will be here; maybe after Bioware sees how well their current GOG releases sell...

True, and I'll be very happy if the Icewind Dale series will be added in GOG, because unluckily they don't run on my pcs (the new and the old one), while the Baldur's Gates run very well.
But what I really desire to find on GOG is still Planescape: Torment, that in my country (Italy) is almost disappeared.

And I would just like to remind people to vote on Cannon Fodder. I mean really, isn't it the best game ever? :)

Bump.
ALSO: Could we make this thread sticky? Some people are using the GOG's Features Wish List thread for listing games they'd like to see on GOG. It would be better if they used this thread instead, but it gets lost among new topics from time to time...
Edit: Oh, I'm sory for double posting. I thought my two posts would merge...