Very nice product! As a sidenote: anyway knows a service that provides human associations? Eg What do you associate with "Hacker" as a person "Computer", "Night", "Internet"
It seems like a good idea, but to automate it you'd need to maybe scrap websites and create a count of words that appear in the same sentence. Or you could get really crazy and start comparing subject/object relationships, etc.
http://conceptnet5.media.mit.edu