Here's a quick look at some games being played with the prototype version of the Steam Controller -- the same version that we'll be shipping to 300 Steam use...
CES 2014: Hands-On with Valve's Steam Controller
Steam Controller Demonstration
New Valve Steam Controller hands on @ GDC 2014
Valve's Steam Controller Prototype Hands-On at GDC 2014
IGN News - Valve Announces Steam Controller
Valve's STEAM CONTROLLER is Pretty Cool
Valve Steam Controller Hands On @ CES 2014