Tried to download the software from the link but my phone isn't to keen on it for some reason and won't allow me to download it onto the phone. (I'm using a Blackberry.)
However I can open Excel spreadsheets on my phone and manipulate them so after another search I found this:http://performancephoto.us/Photocalc.htm
I used it for real for the first time this morning whilst taking photos of our horses. I only used it to give me a guide of what DOF I would have when shooting at 28mm (or 44.8mm with crop factor) at f5.6 and f3.5 from 10ft away. The answer was a DOF(s) about 9.5ft & 5.5ft respectively.
So my theory was horses head would be in focus but anything behind would be soft. Bingo it worked !!!!!!
I know more experienced guys may shake their head in shame but it helped point me in the right direction, Personally I wouldn't of shot at f3.5 thinking the DOF would be to shallow but it wasn't.
Downside, it is fiddly to use, but if you have the time it can act as a guide to help you get the right aperture and DOF for your shot.
I'll continue to use it as a guide when time allows.
Hope this is of use.
If you want to edit any of my images to demonstrate points/techniques to either myself or others please feel free to do so.
Still learning with Canon 40D, 28-135mm, 100-400mm L and Elements 6.
Any Advice greatfully received.