wev, I really like the detail in these images anf think they are some of the best that you have posted.
I shot this today and Google maps measures the distance from me to the subject as 900ft away. This also has a pretty good crop on it. Nikon D7000 with the Tamron using a tripod.
Does your exif usually tell you a correct focus distance? Im not sure mine does, but anyway I like this as a thread idea, post yer "long shots".