STEAMWORKS 2009
Your game can use the same platform that supports over 500 PC game titles on Steam. Steamworks gives you access to a connected community of 20 million gamers and a robust world-wide network, while providing a rich set of proven features that let you develop, publish, and protect your game.

Steamworks is entirely free. There are no licensing fees and there's no charge for bandwidth, retail copies, or OEM distribution.

With Steamworks, you avoid the overhead and delay of certification requirements. Distribute your game on your terms, updating it as quickly and frequently as you see fit.
New and improved for 2009:

Steam Anti-Piracy

Steamworks' anti-piracy suite combines three approaches to anti-piracy: (1) Custom Executable Generation, (2) Retail Encryption, and (3) Valuable Platform-Dependant Features. These work together to provide a seamless end-user experience, protecting your game and giving real value to customers. Learn more

Steam Cloud

Store data in Steam Cloud for your users. The Steam Cloud API allows your game to write and retrieve files for each user. Use it for personalized settings like keyboard, mouse, and gamepad configurations, multiplayer sprays, or even saved games. Steam Cloud is a natural extension of the portability that Steam affords gamers. Shipped with Left 4 Dead, Steam Cloud is now a proven resource and is becoming an integral part of the Steam experience.

Matchmaking / Lobbies

Steamworks' multiplayer back-end is powered by robust matchmaking and lobby technology. The same technology that drives the quick and accurate match-ups in Left 4 Dead can be used in your game. Works with both peer-to-peer and server-based games. Steamworks' built-in voice functionality enables players to work quickly to strategize their next misson.

In-Game DLC

Sell additional content from within your game to the customers who want it most. Steamworks provides true in-game DLC, allowing customers to select, buy, and use DLC — all without leaving the game. Additionally, using Steamworks' DLC does not close off your other channels. You are still free to sell the content at retail, either with other online sites or through the Steam store.