@speechie - I have never done powered parachuting, but to me it looks like great fun (but I like that kind of adventure, for example I went sky diving for my birthday and really enjoyed white water rafting).
And it looks like Louisiana swamp boat meets parasailing, except you do not have any water around you rather you just have the ground.
I have watched a video on it, as the descriptions I was reading on the internet just did not cut it for me as far as giving me a great picture. So here's what I saw -
Someone driving what looked like a large go-cart with a large fan on the back with a large parachute attached to them and as they rev forward their parachute starts to lift them up and then the video literally showed the powered parachute riders flying through the air.