QMapControl is a "Qt Extended" (Qtopia) widget which enables your mobile applications to use map data. Simply add the widget to your application, have a look at the API and start developing a fancy geospatial mobile application.
You can displays maps from WMS servers or tile servers like OpenStreetMap. Custom data can be added: points, lines, images or even other widgets like buttons. All those can be bound to a specific coordinate. A parser is included, which reads data from gllin. QMapControl is still in development, hopefully some people join the development.
project website: http://www.medieninf.de/qmapcontrol/
project at sourceforge: http://sourceforge.net/projects/qmapcontrol