Introducing POIXpress 
Before Nokia Maps aka smart2go I didn't paid much attention to the landmarks stuff included in S60 3rd. In fact I don't know any other application which really uses the landmarks yet. But smart2go does and it does it well.
The only problem for me was: My device don't has the built in landmarks application and without that application you can't use the LMX import. (And you can't use "Send waypoint" etc. in smart2go … but that's no problem to me).
Since I don't have any POI files in LMX format I don't really miss the landmarks application. Instead I made a small application to import ASC and OV2 (TomTom format) files. And it can export in ASC, GPX and KML format. (Since Nokia Maps is nice to create landmarks and I can use them in Google Earth and other applications this way I think it's very cool.)
I hope you like the application the same as I do.
The only problem there is that the landmarks stuff is so slow. You should limit the number of landmarks stored in the phone. Otherwise Nokia Maps might get too slow to be useable. (At least that was my experience with a lot of landmarks. And POIXpress gets really slow,too. So it doesn't seem to be the fault of the beautiful Maps app.)Read more:
POIXpress
