I am so not a lawn guy. I don't care if I have a "grid pattern" on my lawn. So if I zig back and forth a few times at least I'm having fun. This guy seems to be having fun while mowing about everything twice....

http://hackaday.com/2011/08/25/how-not-to-build-a-robotic-lawnmower/

If will definitely take a learning curve. hopefully I will not mow down the house.