Rich, here's link you might find useful.
http://home.comcast.net/~jonsachs/
The software called Ephemeris is used to calculate the moon phases based on your geographic location and runs on Windows PDAs. There is also a DOF calculator and exposure calculator. All 3 programs are free and were written by Jonathan Sachs, the programmer that gave us Lotus 1-2-3. I use them all and the PDA format lets me take them into the field when I choose not to drag my laptop with me. :cool: