PlayStation Portabel (PSP) now has an application similiar to Maemo-Mapper:

http://www.pspaccess.net/modules.php...rticle&sid=595
http://www.youtube.com/watch?v=_nitCHViaCU

And Nintendo DS:

http://www.natrium42.com/blog/?p=31

Some features of these might be interesting for Maemo-Mapper.