I found this, just to give an idea. http://video.google.com/videoplay?do...0802105160028#
And I agree in many ways, why would we want these? At the same time, you have to wonder what the capability will be in another 20 years or so and what the combat will become ground-wise.
Tanks are currently huge pieces of equipment which I'm sure they have already considered downsizing, possibly to a one man vehicle. Or, as we're seeing with current equipment, going to UAVs or small tracked vehicles with guns.
There is always a possibility that a tank can't get into certain areas in warfare and a walking machine may be necessary. (say heavily forested or bogs and swamps)
I'm just more of curious what the possibilities are.