It was once said that the computers on Apollo 11 had less computing power than a modern pocket calculator and now we can read to machine code and see! The code for the Apollo Guidance Computer, or AGC has been transcribed, by Google, from scanned images of printouts for both the Command Module (codenamed Comanche054), which reached moon orbit and was the return vehicle; and the Lunar Module (Luminary099), which took astronauts Neil Armstrong and Buzz Aldrin to the moon.

Google also provide a virtual AGC which is an emulation of the on-board Apollo guidance computers, along with some ancillary items needed to make the emulation do something interesting.

You can see the Google Blog entry about it all here.