I just found this app the other day called Sofortbild. Weird name but it works great. Website: http://www.sofortbildapp.com/
Sofort Bild = Instant Picture with quick translation from German to English
As the program automatically transfer all captured images instantly to you hard disk it is actually a pretty good name if you think about it.
Another, very simple, way to accomplish this is using a special SD card, provided your camera uses this type of card. I'm not familiar with Nikons but I'd assume many have the SD card option.
That card would work with anything that has an sd card slot it is independent of the camera's software.