One idea could be a button to show the google streetview overlay - so you know which streets are covered and which are not. Like in http://www.tomch.com/maemaps.html , V button.
I think this is useful gmap. however, i have some suggestion for that version. if you could write an app for N900 that would be awesome. because running on browser is painful. the navigations buttons seem small and not respondsive sometime, hard to see, the arrow sign isnt standout. zooming button is overlap with gmap defalut clock wheel. should include bigger rotation button to avoide using n900 stylus. address search box should be larger for easy viewing, at lease 75% of total screen, 3 functions button should be redesign, cos i really have no idea what the other two represent until i click on it.
Nikul please that streetview event isn't so good. It makes impossible to use hover mode and move the map, that in my opinion is better than using the arrows.
Also, place finding seems to have stopped working.