While some have used modRana for directions between point A and point B, I tend to use the software for information/searching.

I've used modRana as a basic map while on travel in Ireland -- no dataplan necessary. I'll download the tiles beforehand, and then use them for inferring basic walking/driving directions later. While the software isn't perfect for this task, it's so close -- the emerging offline routing libraries could turn this into a killer feature.

Sometimes I just download tiles and look at the map. For someone who grew up drawing imaginary streetplans, modRana is candy for my head.

At home or work, I'll search for the closest store or hospital or park by doing a place search around a view or location. It's like Google Local for Maemo. Again, being able to run these searches on Wi-Fi and cache them for later retrieval would be so useful.

That's about the extent of my modRana use. It's been one of the nicer features of my N900.