How to try SteamVR (Updated)

Hook up your HMD

Run Steam

Pick "Virtual Reality Mode" from the "View" menu

There have been many fixes to VR mode in Steam lately and the old instructions are now completely useless, so it's time for a new thread.To try VR mode in Steam:VR mode is supported on all clients on Windows and in the current client beta on OSX and Linux. To opt-in to the client beta look in Steam->Settings and then change your beta participation. The current beta also includes some bug fixes to make SteamVR work better on WIndows.