I finally got around to building a new lumber rack in my woodshop (I took some time off from work to help out with the new baby, but the woodshop was calling me...).
The plans (I'm not sure if you would call what they published "plans", but anyway) came from Fine Wood Working.
It is bolted to the wall using 6" lag screws that goes through 2X4 into the studs.
No more lumber on the floor.