So first Adam got some good compost/dirt out of what we call The Pile from out behind the shed and them made a 3 inch or so layer on the ground (which we did NOT turn under).
Then cover with more dirt goodness (I think about another 2-3 inches or so) and finally cover with straw.
After the potatoes start growing up through the straw, you keep adding dirt/straw/dirt/straw until you fill up your bin. *In theory, mind you, we haven't ever done this before.*
We've heard that this is a great way to grow potatoes and that usually the yield is very high.