Valve launches the Steam Controller without the Steam Machine - The Verge

1. Valve launches the Steam Controller without the Steam Machine  The Verge
2. Here's what we think after a few weeks with the new Steam Controller  Ars Technica
3. Valve's New Steam Controller, Coming May 4, May Be My Favorite Controller, Period  CNET
4. Steam Controller Price Leaked Thanks To An Early Review  Insider Gaming
5. Valve's Steam Controller costs $99 and arrives May 4  Engadget