OSM maps of Vanuatu focusing on Error detection
Cloudmade's OSM Error Edition maps of Belize
Cloudmade's OSM maps of Cameroon for OSM improvement
Very nice and completely routable maps based on OSM data by Lambertus
Bike map based on OSM data of Hungary by VeloMap
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.