NASA's Nanosatelite System

Take a look at NASA's latest revision to it's Miniature Autonomous Extravehicular Robotic Camera (Mini AERCam) designed to help out spacecraft and ground crew see around and inside the spacecraft. The latest prototype, "nanosatelite", is 7.5 inches in diameter and weights around 10lbs.

"The Mini AERCam could provide beneficial on-orbit views that cannot be obtained from fixed cameras, cameras on robotic manipulators, or cameras carried by space-walking crewmembers." [Link].

Here's a good summary of the satellite's features. NASA itself also has a website devoted to the AERCam with an excellent overviews of the mechanical design, navigation, avionics, propulsion, vision, and power systems.