Apparently food carts are a very big deal in Portland, Oregon. So big in fact that Microsoft has developed a new mapping layer that allows searchers to locate these carts in the Bing Maps service. This new layer is joining the ranks of other food cart finders including a maps layer from FoodCartsPortland.com on Google Maps , and Yelp's "food stands" business tag . The carts are mapped out in the same way as all locations on the maps (like viewing cart hours, photos,