Meh. I've already got TomTom and Navicore on my N80ie covering the U.S., Canada, Europe, and the Middle East.
Not really needed on my N800.
For nav, VoIP, and phone calls my N80ie is fine.
For email, web browsing, reading ebooks, and watching the occasional "Top Gear" episode there's my N800.
Although I have used Maemo Mapper before to map out the boundries of 400 acres of family farmland though. But those uses are rare.