I'd love to see a heat map of the world showing different types of activity in each area (mining, scraping, most travelled routes, etc.). With perty colors.
Primarily, I'm a nerd.
But in addition, it would be nice to be able to use this map in real time to find the best possible area for a given resource (rocks, durrr).
I realize the second part might be pushing it performance-wise (and some will say fun-wise, I'm sure), as it would have to be a heat map of the most recent 5 minutes or so to be useful.