Staying on the subject of linux, according to LinuxDevices.com:
FSMLabs reports that its real-time Linux distribution was used by Blue Mountain Avionics to build an electronic flight information system (EFIS) or “glass cockpit” for experimental aircraft. The EFIS/One offers dozens of solid-state instruments, digital autopilot, an air data computer, and a built-in flight recorder.
Here’s the full article with many nice pics. Click the pic below, that device goes for around $15,000. Nice gadget!