Would you like to have simple polygons of the Barrington Atlas map grid squares? Maybe for munging an existing placenames list up against BAtlas IDs?... We're using them to help keep you updated on Pleiades content digitization status.
We've started putting the grids up on the web in KML 2.2 under a cc-by-sa license. We'll keep you posted as we add more. Meanwhile, get them here: http://atlantides.org/batlas/grids/