Best Selling Product Ranking

Settings:
Control this app by tagging products you would like it to ignore with: "OOS-Ignore".  Otherwise, you can just watch it work!  
How it works:
It checks through your entire store once per hour, or as often as it can given the number of products.  It checks about 3,600 products an hour.  Any product it finds with no inventory, it will tag with "out of stock".  If it has inventory, it will remove the tag.