We are using an ActivMedia Pioneer 2 AT for our experimentation.
This all terrain robot is equipped with two black and white cameras.
It also has front and rear bumpers.
Here are some pictures and videos of the robot (click to enlarge):
 

Pan-Tilt Unit with the two cameras.	Video of an application developed for our robot (early version).
Definitive version of the control interface	The robot in action
ARGOS project team (from left to right: Raquel, Jose, Dídac, Ramon, Carles)