Googles licensing terms for the data are troublesome, basically unless the you have specific deal with google regarding the use of data you're not allowed to (this is why you need to add the google tile servers [at least semi-]manually to most of the map-applications that support google tiles at all).

Thus anyone wanting to make a native application to view that data would need to first get permission from Google (I'm fairly sure the Android one is provided by Google itself...).

Best would be if Google themselves would publish a native version for Maemo but I don't see that happening (being that maemo/meego is a direct competitor for android and great apps mean a lot in platform differentation [in fact they might not-grant to special permission to use the data for same reasons]).