From a URL like this, (a link that has some lon/lat and zoom info) I can find the boundaries of the image, and download the tiles into OBM.
I do not remember how but in worldwind, one have the possibility to show in a window, at the top of the application, the current downloading of the map ( blue marble, virtual earth/landsat... ) that you see in worldwind, and by the fact, the complete server http adress of that tiles. That, two or three years ago. Try to see if you can make something with that.
Also: when you go on the Bing map page there is a possibility to get the long/lat/level of a map that you are seeing, that through the"share" button. But the link is related to the Bing site. For example:
http://www.bing.com/maps/?v=2&cp=51...59501585290652&lvl=15&dir=0&sty=a&form=LMLTCC
Meaning that, at the same time, all the pictures are in the cache of your browser or, if you want to register the page on your hard drive, as a jpg files, in the ..._files folder of that page. The problem is that the names of that jpg have to be "decrypted" to reorganise them from north to south and east to west.
I, in the past, begun to explore that encryption ( with google maps ) in the intention to understand, compare, between sources ( google, virtual earth, yahoo...), scales, rendering, level of details... but i have not completely finished the research relative to that jpg naming.
http://www.orbiter-forum.com/showthread.php?t=21316&highlight=sasplanet&page=4
(see: "Here, a preview images, during assembly, recovered in the folder on the desktop of the registered page...")
I hope that you understand what i'm writing, because my English knowledge is poor...
EDIT/
If i take a look at the jpg ( six jpg ) names on the Bing link provided, and only the six last numbers for each - once redistributed to obtain the right map - i have that:
- from left to right
...130031,...131020,...131021 ( first row )
...130133,...131022,...131023 ( second row ).
Let's consider only the:
131020,...131021 ( first row )
131022,...131023 ( second row ).
This looks furiously as quadtree ? ( don't remember exactly the name ) numbering in the bing/Worldwind/VirtualEatth... maps, as described in documents related to Worldwind.
What to do with that ? I don't know.