MowerBot!

They got funding and seem to have a market.

Precise Path Robotics Inc. is preparing to unveil a $30,000 robotic mower for golf courses that will begin shipping in mid-October. The Indianapolis start-up just raised $4.5 million in funding from angel backers Scott A. Jones and Charlie Staples, to give it $10 million in total backing.
Precise Path primarily builds the software and sensor technology for robots and outsources the manufacturing component, said Jason Zielke, the company's president and operating chief.
The robot can handle unstructured environments, according to Mr. Zielke. That means if a gopher jumps in front of a robotic mower, for example, sensors inside will detect it and correct the mower's course, he said.

An Indiana company
HT VentureBeat