2008
Valve Acquires Turtle Rock Studios
a California-based game development company responsible for one of 2008’s most anticipated titles, Left 4 Dead.
Source:
Valve Press Release
Valve Unveils Steamworks giving third-party game developers the business and technical tools of the Steam platform free of charge.
Source:
Valve Press Release
Valve releases the first major content update for Team Fortress 2 known as The Gold Rush Update or the Medic Update.
The update included three new Medic weapons (the first alternate weapons in the game), a character loadout system, Medic achievements, and a new Payload game mode.
Source:
TF2 Blog
Steam hits over 15 million active accounts and over 300 games.
Source:
Valve Press Release
2009
Steam Cloud is released to developers free of charge enabling seamless application data syncing for all Steam users.
Source:
Valve Press Release
Valve announces Portal 2 via Game Informer following an in-game patch to Portal that included a new “Transmission Received” achievement that led to an epic alternate reality game (ARG). Half-Life fans’ excitement turns to disappointment as another Valve game is announced while their wait continues.
Source:
Wikipedia
Valve announces it will be bringing its Steam platform and Source game engine to Mac OS X.
Source:
Valve Press Release