For all ages: Parrot’s AR.Drone iPhone-controlled quadcopter.
For Mom: a robotic vacuum from Neato or iRobot.
For Dad: the adaptive cruise control option for his new car.
For Grandparents and their grandkids: Pleo, the baby dinosaur.
For little kids: Zhu Zhu pets.
For pre-teen boys: RoboRaptor.
For pre-teen girls: Bossa Nova’s Penbo robot and her baby Bebe.
For robotically-interested 10 yo and older: LEGO Mindstorm robot kit.