Computers' feeling are just a way to look aw the functioning of computers. Thex do not alter the functioning of computers but just show more clearly the analogy of human and computer functioning. In addition comes of course the expression of emotions but it is something that makes life with computers easier. Aldebaran Robotics already has a robot capable of showing emotions.
Each goal creates needs: something ought to be done in order to reach that goal. The tendency to answer those needs, to do those things, is perfectly analogious to human feelings. So the feelings of a computer correspond those of a goal-oriented person. Via holistic objectivity the computer would gain human like emotional life.