I've had a long session today of improving CartoType's conversion of OSM data to its own format (CTM1 = CartoType Map format type 1) and writing a new style sheet to display OSM data more as it should look, and after quite a struggle I've met with some success. To recap, CartoType is a map rendering library that runs on mobile OSs like Symbian and Windows Mobile as well as on Windows (and Linux, Mac, etc.) It is not open source, but I shall make CartoType map viewer programs freely available, as well as the data conversion tool, style sheets, etc., so that people can look at the whole of the UK on their mobile phone without having to go online. The OSM data for the UK should fit into about 35MB in CTM1 form, so that's quite manageable.