Since I'm almost done writing my extremely belated review of The Design Matrix , I thought I'd share a tool I wrote for myself for use in future discussions in case anyone else found it useful. Basically it's what I call "D-matrix Analysis Online Calculator" or DAOC. The computation itself isn't very intensive but what I like about it is that it dynamically generates a histogram of your calculation. You can then print this out and save it for your records. As more information becomes available or as you continue to do it for more and more systems (or what have you), you can then compare and contrast and do an overall analysis.
Maybe in the future I'll make it so people can log in and save their calculations online. I would appreciate any feedback/suggestions.
You can find it here.