There is now a viewer out with some Oculus Rift support. It is incomplete. But, according to the web site you can stick your head in and look around. See: An Initial Foray into Second Life with the Oculus Rift.
There is currently no User Interface. The author of CtrlAltStudi Viewer, David Rowe, says the Lab will soon release a Oculus Viewer with a UI. I’m not sure exactly what ‘soon’ means in this case.
As it is now:
Use the viewer as normal to get to where you want to go, then toggle into “Riftlook” mode (“3D” toolbar button or Ctrl-Alt-3) and don your Rift headset. Move your head to look around and use the arrow or WASD keys to move about. “Forwards” is the direction your Rift was pointing when you toggled into Riftlook. It makes most sense to use it while sitting down.
Jo Yardley is going to love this.