It would be nice to have Web Map Service client on nokia 770. Is it too difficult to implement it part of maemo-mapper? Specification can be found on OGC's website (http://www.opengeospatial.org/). With WMS support it will be possible to create own servers with MapServer (http://mapserver.gis.umn.edu/) or any other WMS compatible server and put your own maps online. https://www.osgeo.org/ could be good starting point to Open Source GIS.