HERE at the Prepared LDS Family Blog. I had forgotten about it until I found it again and posted (again) on what a great idea it was!
Hubby was home today, so I talked him into making the stair steps. My shelf has 4 tiers made from a 2 x 12. The bottom and top shelves are 2 x 9 and 2 1/4 (from one piece of 2 x 12) . The middle two shelves are 6 3/4 and 4 1/2 cut from another piece of the 2 x 12. I think it turned out GREAT!