OzzieAu, that thing looks amazing. Awesome for low-flow situations. Wish it could be used for prospecting in NSW (Although it would take a while).
Nucopia, I get what you are saying about it not being applicable to your situation, you have to get the water out of the ground. So you need a solar pump/windmill or some sort of mechanical device to get it out of the ground.
Could you create some sort of basin at your pump where you could pump the water out, then use something like this to move it up the hill then use irrigation to move it back down again to your fields?
You'd still have to get the water out of the pump, so maybe a combo of one of the contraptions that have been posted earlier in this thread combined with this? Or maybe even a converted bike so you can use pedal power/gearing instead of just your arms?
I also wonder how much the bunyip pumps cost.