First game you ever bought on steam?

Orange box at 2009 I guess

The Orange Box (Nov 2010) like many others.

if you count retail too then its orange box :D

My account history doesn't go back far enough to when I bought Half Life 2... Probably around 2006.

Nov 29, 2009 $7.49Purchase
Left 4 Dead

16 Sep 2008 - RACE 07 Czech and Polish

Team Fortress 2
Member since: October 7, 2009

Dec 26, 2009. L4D2 Retail. ^____^ 500 hours later, it's still the best Christmas gift ever.
First thing I paid for though was Apr 4, 2011. Amnesia: The Dark Descent. Apparently I thought $10 was a good deal lolll..

King's Bounty Platinum and L4D Bundle, 7 Jul 2011

29 May 2008 $14.99 Purchase
Counter-Strike 1 Anthology

Portal when it was for free for 2 days XD

Then i think i purchased Amnesia

January 26, 2005. HL2 retail which activated steam.
If that doesn't count then the actual first purchase was a pre-order of l4d2 in Sept 09.

8 May 2006, Half-Life 2 GOTY retail

17 Feb 2008, Audiosurf. //
27 Jul 2008, The Orange Box

Had Half-Life 2 for a long while before that. My Steam profile says I've been around since 22nd of March 2005, so I guess it must have been then.

20th of July 2008 - I bought Team Fortress 2 for $24.99

Left 4 Dead 2 (preorder)

and now i get asked about bill hat every day :3

Member since: January 28, 2004

Half-Life Platinum Pack Complimentary

Would not have joined if it wasn't for the WON shutdown.

October 10, 2010 - Shank and Deathspank

May 23rd, 2009 - Half-Life 2 Episodes One and Two including Half-Life 2: Deathmatch in a bundle (Retail)

Wouldn't have bought it if it weren't for the Source mod remake "GoldenEye: Source"

Terraria was my first purchase through Steam only in June of last year.

I got Portal 1 for free. If that counts. My 1st ACTUAL purchase was Star Wars: BattleFront 2.

My BEST purchases were: GMod+CSS, Splinter Cell Conviction, Skyrim, TF2, L4D2

21 Jul 2009 Half-Life 1 Anthology $14.99

My first purchases on the Steam store were during the Halloween sale in 2011. Plants vs Zombies, Cthulhu Saves The World / Breath of Death VII Double Pack, and the Painkiller Complete Pack. Soooooo October....30th?

Left4Dead Retail, but my first purchase trough steam system was Bad Company2

December 29, 2004 -- Half-Life 2 Retail Standard

December 2011 - Gmod =)