NKRemote

From Breeze Systems:

NKRemote is software for remotely controlling your Nikon D90, Nikon D5000, Nikon D300, Nikon D300s, Nikon D700, Nikon D3X, Nikon D3s, Nikon D3, Nikon D200, or Nikon D80 digital SLR from a Windows PC using a USB cable. NKRemote enables the professional photographer to display live images on the PC screen, auto focus and manually control focus from a PC, automatically take a sequence of photos and print them out, enable customers to view pictures while you continue shooting, preview images in black and white or color, and store images directly onto the hard disk of a PC ready for onward transmission.