What was your first game on steam? GA ended.

CS 1.6 on my old account. Alan Wake Collector's Edition on this one.

Fallout New Vegas Ultimate Edition.
I totally have to play it again, now that I have a decent GPU.

The Banner Saga

MW 3

On my old account it is Half Life 2, on this one it is The Orange Box :)

I first installed Steam in order to play (the free-to-play) Team Fortress 2.
Where did those other 600 games come from?! :3

Killing Floor, gifted to me by a friend on July 14, 2013

Cities in Motion 2 and Grid 2

Half Life 2 - Dec 13, 2004!

It's actually really interesting looking at old Steam purchases. I bought 2 games on it in 2005, 2 in 06, 2 in 07, and then it just explodes from 08 onwards.

Skyrim boxed version, I was totally pissed I had to activate it on steam.

04/05/2012 - Batman: Arkham Asylum GOTY. Originally created my Steam account for sales on the few GfWL titles that were available here back when I still achievement whored on the 360. Now my whoring is almost exclusively PC.

Half-Life Platinum Pack :)
To play Counter Strike v0.81 back in the day. Had to activate it in a new program called Steam, to be able to continue playing CS

Fallout New Vegas

Bioshock Triple Pack

I totally forgot it was Hydrophobia: Prophecy! I remember it was a pretty good discount and I had seen the game somewhere before and I was really excited, but I barely played it because I got stuck somewhere in the beginning and I was too lazy to look up a walkthrough. Too lazy for 3 years and a half :(

HL1 / CounterStrike ..not quite sure, it was >10 years ago

Football Manager 2012.
Didn't want any bloat-ware, but Sega made Steam mandatory, and here I am now :P
Nowadays, I'm happy that I don't have to play my games via DVDs, like I did before getting Steam...

left for dead 2

On my previous account it was Counter-Strike 1.6
On this one it was Dota 2.

Bastion & Its Soundtrack

Just Cause 2 + all the DLCs.
Is anyone really surprised though? :P

Bought Dark Souls the first days it was released for PC and it is the only game i bought without any discount.
Still i haven't finished the game,i should do it some time but i keep playing other stuff or watching series.
Or maybe it's too frustrating for me and my nerves can't handle it dunno xD

Killing Floor :)