I played around with the maemo-mapper yesterday and today... and is great!
I tried once to download map along the route, and it did download, but the wrong maps (this is the only problem I saw). Here is the screenshot:

http://www.poze.org/screenshot01.jpg

What I think will be useful in future versions is to be able to mark a point, for example "My House", or "My Office".. etc. Anyway less features means stable application and I prefer stable!

Thanks again gnuite.