The United Space Alliance has announced that the ISS (International Space Station), has swapped it's computer system from 'Windows XP' to Linux.
Reason, stability and security. 'Debian 6' would have a much small chance of infection over the aging 'Windows XP'. Linux is also the OS of choice amoung the scientific community.
Extreme Tech has a story on it. If you have a look at the photo there is already a little Linux penguin sitting on a solar panel.