Standard OSM map of Mexico by Computerteddy
Cloudmade's OSM maps of Azerbaijan for OSM improvement
Frequently updated routable OSM map of France by 'alternativaslibres'
OSM map focused on MTB and hiking of Malta
OSM map of Luxembourg by Computerteddy
This is a collection of nice topographic maps from Afghanistan. They feature roads, rivers, settlements, POIs and contour lines. They also provide english transliteration of the names.