Well, maybe not actually take out trees and bushes, but would help significantly.
Here's my dilemma, I landscape, and the worst part of my job is tearing out old juniper bushes (and other low to the ground plants that make you itch). Anyway, they're so dense most of the time that you can't even get far enough into the plant to clip the branches. So most of the time we end up cutting off all the branches with a chain saw and digging the stump out, and that can take a while and makes a mess. Juniper is nasty stuff and spreads its roots up to 15 or 20 feet sometimes. By far the easiest way to rid yards of these beasts (which end up spreading and making your yard seem much smaller and less functional) is to loop a chain around the base (the trunk) and pull them out with a truck. Sounds easy enough, but the tricky part is getting the chain around it. The bushes grow so thick that you can't get at the trunk. Here's where my robot comes in. The Juni-bot will go right under the umbrella of thick, itchy branches, and tow a chain in a circle, around the trunk, right back to you! This idea would work for any tree trunk/base that you can't see, not just juniper. I see a problem and a way to fix it; this would cut down time and resources, and much pain ;-).