A new map (here in pdf) shows progress on the fence along the southern border. You need to blow it up a little to get a better look, but the fence is finished or under construction along almost all the border from the Pacific to El Paso, though in some places it’s a vehicle barrier that prevents smuggling vans from crossing but not people from relatively easily hopping over. A spokeswoman for the border agency tells me that none of what’s shown is “virtual fence” as opposed to an actual one, and that they’re building about 50 miles a week at this point. You can see some of the fence from satellite maps, too, like Google maps — if you look at California, for instance, its shadow is the black line that’s parallel and just above the white line they’ve superimposed on the images to demarcate the international border.