Actually, I was wondering how long it would take for someone to create an emulator that would allow original Apollo mission source code to run on a modern PC. Slashdot linked a notice that it has now been done.
Since this computer was designed to do a very specific thing with *very* limited equipment, it's not really a simulator of any sort. Rather, what this guy has done is write a program that re-creates the Apollo computer exactly. The only difference (ideally) is that this computer "lives" inside another.
As noted on the site itself, people are using this "computer" to create high-fidelity space simulations, which means, with the right peripherials and carpentry skills, it should some day (soon!) be possible to create a 100% authentic Apollo flight simulator using PC equipment.