Here are a couple of photos of what I use. It works for the wind, but I like it more for blocking heat and drawing away smoke. Sorry, these pictures aren't the greatest. I can post some more detailed ones this weekend. It is made with three pieces of 8 inch stove pipe, some wire, and nails.
Two of the pieces of pipe are fitted normally, with the third formed into a wind/heat shield. The piece of pipe at the level of the forge has an approximately 6 inch half circle cut out of it. It draws very well, making starting fires easy.
Dan