In the last few years of we have developed a number of different active vision systems.
These are pictures of our first generation active vision system:

Our second generation active vision system:

You can see this system performing both monocular and binocular tracking here.

The most recent active vision system:

A detailed view of each eye

See this system:

• Moving the central platform (here);
• Moving one of the eyes (here);
• Performing monocular tracking (here);
• Performing binocular tracking (here);

Remote control of one of the systems using a helmet:

This helmet has been used to remotely control the binocular active vision system.
You can see here a mpeg movie. A microsoft wmv movie here.