I thought that this was a great podcast. I work in a retail environment and I know how task significance is important. I find that my job can be very repeative, but when i outfit a customer and they come back and tell me about how much of a great time they had, it makes me feel happy.
I understand that if you think that your work doesn't make a difference, you won't have much job satifaction. I really like this postcast and the study that was done.