From an anonymous source close to the company, I've found myself in
possession of the "Infocom Drive" — a complete backup of Infocom's
shared network drive from 1989. This is one of the most amazing archives
I've ever seen, a treasure chest documenting the rise and fall of the
legendary interactive fiction game company. Among the assets included:
design documents, email archives, employee phone numbers, sales figures,
internal meeting notes, corporate newsletters, and the source code and
game files for every released /and unreleased/ game Infocom made.
http://waxy.org/2008/04/milliways_infocoms_unreleased_sequel_to_hitchhikers_guide_to_the_galax/
