Yesterday I uploaded spatialite into Fremantle's extra-devel.
Spatialite itself isn't directly useful to the average Maemo user, but it ca be lot of fun if you're a developer and are interested in GIS.
Spatialite is a sqlite3 extension for geo-spatial data and compatible with OpenGIS, which means you can store any map's nodes (using a OSM nomenclature) into sqlite and use them in your application, with SQL methods that will make easier the management of the node in the map space.
For more info http://www.gaia-gis.it/spatialite/ and http://www.opengeospatial.org/
If you need something more powerful you might give a look at http://postgis.refractions.net/, but this is a bit heavy for Maemo :-p
Soon a new version of Map Buddy will be available, supporting point of interest from OpenStreetMap (theoretically any source) and using spatialite (the reason for which I uploaded it), but I'll write specifically about it in another post.