For what's it's worth, I recently wrote an open-source program for use with Park's TM-1 tension meter that automatically converts the deflection reading to kilogram-force and makes a plot of the wheel.
Wheelwright :
http://biciworks.com/wheelwright/
This is reminiscent of a spreadsheet from Park out there. I'm still working on making it easier to install, but if you have one of the fancier tension meters out there and would like to help me add it into this program send me a message.