IEEE Spectrum has info about a new autonomous lawnmower from the German company Bosch. Seems the only official info available at the moment is a Swedish press release but it appears the mower communicates with its docking station (and maybe GPS) allowing the unit to cut areas in ordered parallel lines rather than the chaotic back and forth paths you see from other sensor based robotic lawnmowers or vacuums. You will still have to install wire around the perimeter so the robot stay on the grass. The battery lasts 20 minutes per charge and resumes where it left of after a 90 minute charge.