I upload some of my sketches on Flickr. One of its most attractive features is the map: you can geotag your photos –in general, all your material– to show where they are taken. Unfortunately this map can not be easily embedded on websites, thereby I have been maintaining my own urban sketches map in Google Maps for the same purpose.
Each blue flag on the map represents a different sketch. When a flag is selected, a thumbnail of the sketch and a link to the blog entry are shown. There is also a zoom in option, so it can be explored the area where the building, landscape or urban element is located. And even the street view can be used when the link view larger map is followed!