Heres an interesting little article on a operating system that I knew nothing about.
Its easy to forget that there are tons of operating systems besides the typical win/linux/mac. Most of these OS's preform a specialized function. QNX is geared towards the manufacturing sector where a computer crash could mean a $50,000 car on the assembly line gets wrecked. QNX is made to be rock solid and features a nifty micro kernel.