Just received a post from mafiatounes on Nokia Discussion with some good news, let's hope it is true indeed:

Nokia N900 to Get Ovi Maps 3.03:
http://noknok.tv/2010/01/22/free-ovi...nd-nokia-n900/

Extracted from the article:
"Ovi Maps will initially only be supported by 10 smartphones. If you’re a Nokia N900 user, which runs Maemo 5 rather than Symbian, thankfully support is on its way. Read on to find out more…"