Benjamin Von Wong has a short and sweet tutorial on how to wirelessly tether a camera to a computer (his post is Lightroom Specific, but I assume other programs will work in a similar manner).
You gain quite a lot of benefits from shooting tethered as Ben Explains: “Why tether you ask? Focus checking, framing, presenting shots to the clients on an actual screen, camera controls, live view, just to name a few… And all those are possible tethered directly to an iPad or a Computer using a nifty 300$ device named the CamRanger.“
The caveat is that indeed you would need to say goodbye to $300 for the unit, but if you are doing large scale shoots and/or need to deliver live results to a client that may be very well worth the money. The teaser video is right after the jump.
[How to wirelessly tether your camera to Lightroom | Benjamin Von Wong]