AFAIK web and mobile maps use the Web Mercator (EPSG:3857)
<http://en.wikipedia.org/wiki/Web_Mercator> projection for rendering
their tiles.
How you put information on top is something different and that is
accomplished with the much easier to handle WGS84 (EPSG:4326)
<http://en.wikipedia.org/wiki/World_Geodetic_System>.
e.g. in Mapsforge (like in other map libs) you put overlays on the map
using with lat, long coordinates.
Also like Philip mentioned, for OSM geocoding you can use web services
like Nominatim <http://wiki.openstreetmap.org/wiki/Nominatim> and/or
Gisgraphy <http://www.gisgraphy.com/>.
--
Emux
Cruiser <http://wiki.openstreetmap.org/wiki/Cruiser> - Atlas
<http://wiki.openstreetmap.org/wiki/Atlas_%28navigation_application%29>
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