I'd heard Alan Kay repeat this many times. I don't know of much hard evidence (I'd really appreciate some, if you do), but I have a feeling that Alan Kay and the Smalltalk community was a great inspiration to Steve Jobs and Apple's way of thinking.
http://www.youtube.com/watch?v=ob_GX50Za6c
To put it in context, he starts off by talking about the efficiency of animal locomotion. In the animal kingdom, the condor is one of the most efficient. It uses the least amount of energy to travel a kilometer. Human walking is rather inefficient in comparison. However, with a bicycle, a man can blow away a condor.
Alan Kay's essay by the same title is here: http://web.archive.org/web/20080107173514/http://www.iam.uni...
Some other similarities off the top of my head: Alan Kay also often speaks about "building systems", and both this article and Steve himself talked about Apple's advantage being "good system integration". Objective-C, inspired directly from one of Alan's brain-children, was at the core of the value of NeXT, which Steve started, and is still at the core of all of Apple's developer platforms.
I don't know if the two have ever met, but I think they certainly hang out hang out with similar-minded folk... ;)
http://en.wikipedia.org/wiki/Xerox_Alto http://en.wikipedia.org/wiki/Objective-C http://en.wikipedia.org/wiki/Dynabook
That said, Smalltalk is overrated.
Edited: grammer.