What you need to make above possible is some serious dough for things like:
* onboard computer with decent processing speed (so it can run something like linux) with a USB host
something along the lines of these two: http://www.gumstix.com/store/catalog/product_info.php?products_id=211 http://www.robotshop.ca/bipom-arm9-gadgetpc-arm-linux-or-debian.html
* two webcams, obviously. spend as much as you care about quality, but make sure that they support
hardware compression (MJPEG is fine). that means less strain on CPU and smoother playback.
* USB wireless adapter with an external antenna jack, so you can plug in a more powerful antenna and
extend the usable range. also, I've heard rumors that the new N standard does wonders in this regard.
* USB hub to plug it all in.
* and of course the robot chasis.
After you have all of this, it's a matter of pluging everything together, setting up linux and writing some software to control the robot from the computer. Easy peasy