For a pretty penny, you can get Plen, the skateboarding robot, to stave off boredom when you're snowed in or to wake you up when you're dozing off in front of your computer. Tiny Plen skates around on your desk, and can even use its balancing skills to skateboard. Watch the YouTube video below -- this little guy's movements are impressive, if a tad expensive at over $2,000. The Plen website's gallery page has additional videos of this hobby robot in action.