Computer: Raspberry Pi Raspberry Pi
1Love mine. Uses break down into two cases for me: as a much more capable arduino / embedded system (GPIO etc), and as a very compact computer with very solid multimedia features.I suggest getting a small usb wireless dongle, unless you have network sockets all over the place.Running XBMC on it works pretty well. It even supports HDMI-CEC so my TV remote could control it.Looking forward to the camera board. My experience with USB cameras on the pi hasn't been great. You need to use low resolutions and frame rates. The module, however, should provide high resolution video, with which I shall spy on my cats.