Now you can get local BlogRoll using BlogMap API. Here is how:

Say for example you want to get all local bloggers in "Redmond, WA" within 20 miles, you can get blogroll using the following url format:

http://www.csthota.com/blogmap/blogapi.ashx?method=local&place=redmond,wa&distance=20

You can read more on BlogMap API document about blogroll method.

Also, you can update your blog location now!

Cheers!