The reason Valve Software doesn’t develop games for the PlayStation 3 is simple: the studio doesn’t like tricky hardware. The stance -- legitimate or not -- has been documented by bloggers since the Internet started in the mid-1920s (shortly after Alexander the Great sacked Coruscant). Still, it’s fun to pull the lion’s tail. The beast responds differently every time.
Thus Loot-Ninja (spotted by Kotaku) asked Valve designer Tom Leonard why Valve doesn’t develop for Sony Computer Entertainment’s shiny black console.
The image is taken from Jim's article, "Wah, Wah, Wah, Left 4 Dead 2." It's a brilliant read.