So, I was teaching a DevelopMentor class at Rice university, and went out for lunch with one of the professors. He asked me if the license plate on his Corvette meant anything. It said, "Zork". I said, "Of course! I'm not that young." Turns out he was one of the original three developers! My brush with fame. :)
Interestingly in these days of JVMs and CLRs, he told me that Zork used a virtual machine architecture. In fact he wrote the VM, another guy wrote the game engine on the VM, and the third guy wrote the story. Which is how they were able to port it to other platforms easily. It just goes to show you that there's nothing new under the sun.
You can apparently still play Zork in several places online. Here's a downloadable version I found Googling for a few minutes.