Am just curious to know! Hee..
As for myself, I got 4 games (bought 3, 1 free) from GoG:
1) Jagged Alliance 2: Unfinished Business
2) Fallout 2 (free using coupon)
3) Colin McRae 2005
4) Sacred Gold
I can hardly finish em, but I still want to own more. Next on the horizon, probably IGI2.

The only game I bought is EWJ1+2. I was thinking of getting Sacred or Giants, but I just bought Clive Barker's Jericho, Call of Juarez, and Gears of War for $30, so I am all out of money.

I haven't bought any yet. I already own a major part of the games they are selling.
But stil,l i have my eyes on at least 5 games that i want to buy from here. Unfortunately I haven't done so, yet, because of the payment options. :(

Just the one: Fallout.
There's a few other games that I'd like from GoG (Fallout 2, Sacred Gold), but I've been way too busy with other games recently! Both new retail games (I recently completed the LittleBigPlanet story mode!), and other 'good old games' bought on Amazon, such as getting the original Dynasty Warriors for the PS1 and playing through The 7th Guest. ^^
So yeah... I'm interested in getting more GOG games eventually, but hey, if I can wait this long before ever playing Fallout, I think I can handle waiting a while before getting the other games. :P

3 so far:
Giants - Citizen Kabuto
MDK
MDK2
I'll probably be getting Sacred eventually, but I'm having a hard time justifying buying the game when it is currently available for free from GameTap. That's also stopped from getting Fallout or Second Sight from GOG, but that turned out to be a good thing. I tried them both on GameTap and didn't really like them (I may give Fallout a second try, though).

Four so far,
Fallout 1 and 2
Giants
Earthworm Jim 1+2
Will be getting Fallout Tactics at some point. Also considering Sacred Gold

1 so far, Redneck Rampage, but planning on buying myself Fallout 1 and 2 soon.

Earthworm Jim 1+2
Fallout 1+2
Die By the Sword
Kingpin
MDK 2
M.A.X. 1+2
Messiah
Freespace 2
Redneck Rampage Collection
Sacrifice
Giants: Citizen Kabuto

I've got 4 so far.
MDK 1/2
Giants: Citizen Kabuto
Lionheart (which, now having played it for a while, I won't personally recommend, btw)
In the not-so-distant future, I'm getting:
Sacrifice
Sacred GOLD
Fallout 1/2
And probably a few others as well.

I got Fallout 1, Fallout 2, and Fallout Tactics as a free bonus with some hardware I bought about a month before the GOG beta. Otherwise I'd have bought at least Fallout 1 and 2.
As it stands, I've bought Freespace 1 and 2, and Sacred Gold. I'm very likely going to buy more, depending on what they add. I love the ability toi grab old games with no DRM, and archive them so I can get to them later when there's a lull in my current gaming.
GoG rocks!

As soon as I joined I bought:
Freespace 1 & 2,
Fallout 1 & 2
I am pacing myself in order to give myself time to play them all.
So I am downloading one each week.
Then I will wait for new games and hit the buy button in December.
(If I don't buy the new Fallout 3)

Fallout, Giants, Freespaces, Redneck Rampage and I think that's it for now.

Fallout
Fallout 2 (Freebie)
Battle Chess SE
Castles 1 + 2
I'm interested in buying more, esp. Sacred, Original War and Stonekeep, but first I have to finish Dead Space. Just started yesterday and I have to say I loooove scary games! :)
I hope GOG will get Silent Hill 2 or Resident Evil! Would be fantastic!

All of them.
GOG.com gets all the support I can give them, even if it means spending money on a few games I am unlikely to ever play.

6 so far
earthworm jim 1, 2 and 3D
F18E Super Hornet
TOCA3
and LionHeart (Not installed yet)
Still want OPF and more but have to wait a bit.