I’d like one… Actually, I’d like several since I also know a few aspiring hackers (nephew, friends kids, etc).
A kit with a Cerberus, motor module & motors, servo module & servo and maybe an RF or bluetooth deal.
I see stuff like this http://www.sparkfun.com/products/11162 and this http://www.robotshop.com/dagu-2wd-beginner-robot-chassis-v2-5.html , which looks pretty cool. A Gadgeteer one that people could add sensors to and program would be even better.
Grab the latter of those two (the Dagu chassis), an L298 Motor Driver module, and either a WiFi or Bluetooth module, and you should be ready for remote control. Alternative means of controlling would be on-board sensors, or (this is what I’m hoping to get done on mine prior to MADExpo), add an IR receiver and command the robot using either a simple remote control, or the controller from a Syma S107 helicopter. 
Perhaps when I’ve got time after MADExpo, I’ll put together a parts list for the robots I’m working on right now, to make it easier to get everything in one fell swoop.
Short version, though, is that the only thing you need to interface with a typical robot chassis that comes with motors is a motor driver module, and the L298 should do well for that.
@ ddurant -
One more thing…not sure whether the Dagu bot from RobotShop comes assembled or not, but I got one that’s very similar from SparkFun for around half the price:
http://www.sparkfun.com/products/10825
$14.95.
Nothing fancy, but two motors, all the hardware, etc. you need to get started by adding a Gadgeteer mainboard, motor drivers, and some sensors. Even comes with a battery holder.
All that and more. Been in the works for long time 
Great! Can’t wait to see what you guys have for us.