I've been working on a map application called "Mapsi" that uses map tiles from Paikkatietoikkuna.

Current features are:

• Downloading and viewing map tiles
• Map tiles saving to database for offline use
• GPS support
• Support for landmarks
• Creating maps from selected area

Version 1.0.0 will probably be released next week. Couple screenshots attached.

Update:
Version 1.0.0 is now in extras-devel in "non-free" section(http://repository.maemo.org/extras-d....0.0_armel.deb). I set application category wrong so at the moment you'll need to download and install it manually (dpkg -i mapsi_1.0.0_armel.deb). At first run cookie from Paikkatietoikkuna is downloaded so Internet connection is required.