http://lesswrong.com/lw/tf/dreams_of_ai_design/http://lesswrong.com/lw/lq/fake_utility_functions/
and many, many other archived posts cover this.
http://lesswrong.com/lw/tf/dreams_of_ai_design/
http://lesswrong.com/lw/lq/fake_utility_functions/
and many, many other archived posts cover this.