Just been working on this and thought I'd share it.
the-division-map.com
Nnice work, however:
Change the font of the streets for easier view
Keep the borders of districts on zoom in
Show elevated areas and subways somehow
Is it flash on html5?
I would suggest that you focus on a Survival Map as there appears to be a lot of call for that, plus there are many main maps out there.
I am not sure how you would represent the multilevels (subways and buildings) on top of each other.