They're maemo and MeeGo... "Meamo!" sounds like what Zorro would say to catherine zeta jones... after she slaps him for looking at her dirtily...
For example,
Google Maps
http://www.google.com/maps/m
Flickr.com's world map works too.
http://www.flickr.com/map/
You can use Fennec or if you install the maemo-location add-on you can use it inside the N900's default browser (microb)
I am particularly looking for one for Yelp reviews and gas prices.