Imagine, when you can train your robots & let it guard your home. That would be brilliant ain't it? We aren't very far from that day.
This TED talk looks more like a infomercial, of sorts, for the company which has built the robot - Romo. However, it offers a glimpse for the ideas or use-cases that one can come up with.
It would be definitely worthy of building an similar Android powered robot - Andro, just because it is more economical. Who would want to buy an expen$ive phone & use it as Romo? :P