Robot, Sit, good robot
If you're like me, you always wonder where's my robot? Well, something tells me I won't get one off the shelf anytime soon so why not just build one. Computers are getting cheap enough also where one could just be part of the chassis too.
The guys over at Trossen Robots have created an ongoing tutorial series for building robots and having them talk to your PC. Trossen Robotics also has some videos explaining bridgeware and show the results of using a few of the sensors in action. They also have all the parts you need to start building right away.
You may end up creating a swarm of robots to take over the world soon.