Like iRobot, the good folks at Boston Dynamics (makers of the famous Big Dog and other awesome robots) have created their own YouTube channel. More importantly, all their videos are there in high-definition (after you start playing, click on the "HD" button in the bottom of the YouTube window), making for a superior creepy-robot-watching experience. Though Big Dog is the most famous of Boston Dynamics's technology, their other robots (like Little Dog and RHex) make an appearance as well.
This one, below, is an example of a video that looks great in high def and it's also one I hadn't seen before: Big Dog in the mud. As usual, its terrain handling skills are beyond impressive, though I'd hate to be the poor intern that had to wash the robot down after the tests.