I've got my project completed: Read about it here.

http://islandinthenet.com/2012/08/23/hdr-photography-with-raspberry-pi-and-gphoto2/

Using the Raspbian “wheezy” Linux and gphoto2 I plan control my Nikon D40 for exposure bracketing of images for use in HDR photography.

I already have gphoto2 installed.  My Nikon D40 is plugged into the RPi via a mini-USB to USB cable.  I have my RPi up and running and I can communicate with the D40 via gphoto2 and capture images.

Next steps are to write a script to:

• Get current aperture and exposure values from D40.
• Compute brackets
• Issue capture commands in sequence.

More info on XBMC for Raspberry Pi can be found on the following site.

http://www.raspbmc.com/