Since this a a wish list...

1) Better GPS support
a) Voice output for turn-by-turn navigation
b) Voice inputs for hands-free interface
c) Auto-rotating map in direction of travel while using GPS
d) Auto-routing when off course
e) 3-D "birds-eye" view (near roads are larger)
f) Line-of-site navigation (with elevation, vertical speed, bearing)
g) Snap to road to make up for some GPS inaccuracy
h) Clear visual indications of upcoming turn (distance (maybe a progress bar), time to turn, large arrow indicating which way to turn, and info on turn to make (road name, exit number))

2) Night time color setting

3) Ability to drag-and-drop a created route to include a new destination

4) Runway layout for airports and maybe what class

5) When using autoroute, long road lengths show up as a single leg in the route instead of being broke up.

6) Better topographical data

7) Add option to include some scenic parts to route based on known scenic roads and/or topographical data such as lakes, rivers, waterfalls, valleys, hills, historical markers, etc.

8) Route with best cellular reception or a route with the least chance of losing coverage.

9) Maybe some options for truckers... routes based on road weight limits, weigh stations, least populated areas for hazardous materials, etc.

10) Grid overlay with latitude and longitude data

11) Ability to import land ownership data