I've just redeemed a coupon for Batman: Arkham City, and will forward the mail with the Steam code to the winner.
It's my first giveaway, I hope everything will go smooth. So good luck, have BATMAN! :)

http://imgur.com/25gyh

About the Game

No escape from Arkham City…the sprawling mega-prison in the heart of Gotham City, home to its most violent thugs and infamous super villains. With the lives of the innocent at stake, only one man can save them and bring justice to the streets of Gotham City… Batman.

System Requirements

    OS: Windows XP, Vista, 7
    Processor: Intel Core 2 Duo 2.4 GHz or AMD Athlon X2 4800+
    Memory: 2GB RAM
    Hard Disk Space: 17 GB free hard drive space
    Video Card: ATI 3850HD 512 MB or NVIDIA GeForce 8800 GT 512MB
    DirectX®: 9.0c
    Other Requirements: Online play requires log-in to Games For Windows – Live 

(http://store.steampowered.com/app/57400/)