No mention of spreadsheets, but how about this quote, from an interview with a 1991 issue of Byte Magazine:
"In 1968 I saw two or three things
that changed my whole notion of
computing. …Doug Englebart’s view
[was] that the mainframe was like a
railroad, owned by an institution that
decided what you could do and when you
could do it. Englebart was trying to
be like Henry Ford. A personal
computer as it was thought of in the
sixties was like an automobile. In
1968 I saw Symour Papert’s first work
with kids and LOGO, and I saw the
first really great
handwriting-character-recognition
system at Rand… And that had a huge
influence on me because it had an
intimate feel. When I combined that
with the idea that kids had to use it,
the concept of a computer became
something much more like a
supermedium. Something more like
superpaper."
Source
