What was your first steam game?

Terraria

Left 4 Dead 2 - never heard of Steam until I had to install it.

My first purchase from Steam was Torchlight and Warhammer 40,000: Dawn of War II though.

The first half-life before Steam even existed. On this account, however, it's was Team Fortress 2.

Counter Strike 1.6 :D

Retail version of Super Meat Boy :3

TF2 back when you had to pay $20 for it,

Left 4 Dead

HL2

Deus Ex: Human Revolution and Civ V, purchased at the same time.

Dota 2.

Counter Strike Anthology

First Humble Indie Bundle

half life :P

I do remember this without checking!
It was Dark Messiah Might & Magic, I got it since I wanted to be able to add friends and I was too poor to buy games ;-;

HL2

Half-Life 1 Anthology

Battlefield Bad Company 2

the orange box

Valve Full Pack

Magicka

Day of Defeat Source

Terraria

Interesting how the majority of people bought a Valve game as their first purchase.

Left 4 Dead 2 :P

Left 4 Dead