Its not the most elegant control scheme, but here we have a video showing a Protos 3 Robot controlled by a HTC HD2.
Protos III is a universal robot used for experimenting with Wi-Fi,Computer vision, line following, navigation and through WIFI. The vision system uses the build in webcam of the netbook and then sends the X and Y axes of the detected object back an Arduino unit through USB cable. The robot then steers and navigate to the target.
The robot has been used in a SWARM test where a number of robots are controlled from the same notebook via WIFI. Protos III.
The robot is a project by Calex64 and is written up in detail on Letsmakerobots.com.