I have used Navicre and it is very good. Easy to use, voice directions, maps are clear and readable even in phones like Nokia 6630, N70 which have small screen. It is a commercial program and what will be the price...who knows.
In that press release was that 770 and software will be available in bundle so that means there will be many who will just buy 770 for navigation. Price for that bundle is very interesting because right now Nokia sell 770 and 6680 bundled also via internet in reasonable price.

Anyway, Maemo Mapper is very good software and it is free. It will be competitor for those cmmercial softwares and that gives people possibility to choose between commercial and non-commercial software. It's good to have alternatives. Keep on going!