Alright, this is really cool. Somehow Oregon programmer and journalist Andy Baio has gotten his hands on a back-up of the late text adventure maker Infocom's internal network drive.
While I'm sure the internal corporate memos make for some interesting reading, the really cool part was that there are two playable prototypes of Milliways: The Restaurant at the End of the Universe, the unreleased sequel to the Hitchhiker's Guide to the Galaxy game.
On his site, he's got a lengthy read dishing on all the details
here
Waaay down at the bottom, he's got a Java interpreter running the prototype...sadly, it seems there wasn't much.
Though all the drama surrounding it pretty interesting.