I just received my WU-1b wireless adapter for the D600. For $60 it's a cheap addition to a great camera and provides live view and remote capture/review of images via an IPhone/iPad or android device.

Admittedly it is limited compared to shooting tethered but creatively it provides a nice addition to the system, particularly if you need to set up the camera in a location that is difficult to view the eyepiece or live view. You can shoot and review although you can't set settings on the camera via the remote device (at least I haven't managed it yet - could be a RTFM/user issue).

Anyway - fun addition and worth checking out if only for the ability to show images from the camera on your iPad. Oh, and also adding D600 images to your iPhone/iPad photo library directly