iRobot had a swarm of Roombas running around its booth. The big news is that they have broken the one million unit point in sales.
iRobot also had this military/police robot on display:
It's a tele-operated robot (called the Packbot) with a camera and various appendages that you can add depending on what you want to do. The most interesting part was the price point: about $150,000!
For more information, visit iRobot.com.