None, bought all my games from steam store

Diablo 3, Half Life, Half Life 2 and a few more...

StarCraft 2 Wings of Liberty and Guild Wars 2 ^^

Several hundred. I did do some PC gaming back when I had a 486 and early Pentium PCs.

Diablo 2 and Total Annihilation: Kingdoms are the only ones that have made it this far with me. The rest are lost to time.

Counter Strike Source, HL2DM, DOD Source Bundle. FIFA 2003, NHL 2001, MGS2 Substance.

Edit: Diablo 2 Battle Chest.

Edit 2: Battlefield 3.

Fallout 3 GOTY. lol

Too many to mention, but the last physical copy of a PC game I bought was the Collector's Edition of Bioshock in 2007.

Skyrim ,The Wicher , dark Mesiah of Might and Magic , Alone in the Dark Sacred 2 :)

Something around 400. I'm a collector.

Other in Steam :)

Everquest, Anarchy Online, Torchlight, Skyrim, Arcanum, Neverwinter Nights, Diablo, Diablo II, Diablo III, Warcraft II, Starcraft II, Age of Wonders, Age of Wonders II, Black & White, Lionheart: Legacy of the Crusader, The Hobbit, Planescape: Torment, Fallout, Dungeon Siege and Titan's Quest. Had many more but eventually gave them away when I replaced with digital copies or just no longer had any interest at all in them.

Rayman 3+2+M, Spore+Cute & Creepy Add-on, Shrek 2+Superslam, Iron Man, Madagascar, Shark Tale, Pirates of the Caribbean: The Legend of Jack Sparrow, Spider-Man 3, Harry Potter and the Goblet of Fire, Need for Speed Underground 2. Essentialy just too many movie based games and a few great games. I don't even remember half of these :/

Mass Effect 3, Borderlands 2, Half-Life, Half-Life 2, Starcraft 2, Starcraft and Expansion, Diablo 1 and 2, and many many more :P

Stalker COC

I'm from Argentina too, but i will say this in english so everyone can read it.
Original games were hard to find, but i got a few ones: Wolfpack (very old one), Hype: The Time Quest (A Playmobil game for kids, pretty good, with swords, magic and dragons), Shogo: Mobile Armor Division (a freakin' masterpiece, totally deserves a chance to play it), and my aunt gifted me The Curse Of Monkey Island and Age Of Empires 1, also original too (best aunt ever! :D).

Now i started to buy original games on Steam and PS3. It hasn't passed a year since i have a PS3 and these are all the games that i got (except COD: Black Ops) http://psnprofiles.com/Karvahl. I got some cheap prices, discounts and good opportunities.

Morrowind, Oblivion, Oni, Mass Effect 2, Dragon Age: Origins, The Orange Box (for all the good a physical copy of that does :P), and the Dungeons and Dragons Anthology Master Collection are on my shelf. Plus I've got some older games from the pre-digital distribution days around here somewhere.

Battlefield 3, COD Black Ops, Assassin's Creed, Assassin's Creed II, Brotherhood and Assassin's Creed 3, Magicka, Battlefield 2

I can guarantee nobody really has a physical copy of Starcraft 2. Even if you have the box with the disc that you bought in the store, There is no game on there:D

Commandos 3

I threw most of them away, so the only one I have now is Skyrim.

I can't remember all of the physical copies I had, but I'm sure two of them was Unreal Tournament and Max Payne 2.

These:

Click!

It was like a year ago. I have more now.

None.

I am not very organized with my game CDs/DVDs so I stopped bothering about physical copies a long time ago. Now I buy them only digitally except PS3 games. Only games I can remember buying physical copies of are ES4 Oblivion and MW3, there are more but I can't remember them, probably lost them somewhere.

I think the last pc games I bought physical copys of were starcraft 2 and skyrim at the start of last year. Since then I have bought from Steam.
I have a collection of probably 100+ games from before discovering Steam.