1.09 update brought the Set map details API, and I already love it.
And I already started using it! I made a tool to automatically generate centerpoints of a map! Now obviously, it has some limitations - it might produce insane values for any "weird" territories (multi-part, with holes, U-shaped), but it sorta kinda works.
The tool will need your e-mail and password to work. This data is not used for any malicious purposes.
It was written in Ruby. Source code available on request. (I'll release it freely later, when I clean it up.)
Executable file for Windows: http://dl.dropbox.com/u/10983006/tmp/centerpoints_uploader.exe
It will have to be placed in the same directory as your .svg file.
If something blows up, make a screenshot of the window before exiting and show it to me.