I believe "the society of mind" contains a bunch of really good but unorganized ideas for building intelligent models, but was written in such a way that it remained virtually impossible to implement them into a working program. Minsky's last book called "The Emotion Machine" tries to reorganize these ideas into one giant architecture composed of at least five interconnected macrolevels of cognitive processes built from specialized agents. Having said that, "The Society of Mind" is one of the most difficult books I've read.