spincraft,
The MC13213 is a cool part. I agree you want wireless RF for a robotics project. A robotics group just started up at http://towergeeks.org. One of the members just announced that he is developing a dual motor module and ZigBee module for the Tower System. This way you can use any Freescale Tower MCU module with these two modules to develop a robot. I know for a fact that some 8-bit S08 modules are coming too.
http://www.towergeeks.org/group/robotics
westfw,
Did you check out linux os support for TWR-MCF51CN-KIT from CodeSourcery G++ tools? http://www.codesourcery.com/sgpp/lite/coldfire
Also, coming soon is TWR-MCF5225X-KIT; there you will gain USB host/device/otg and CAN on top of Ethernet.