Think we might be able to rent the roof of our homes or offices as virtual ad space?  From the All-points Blog:

Virtual Earth 3D Futures

Forbes looks at the Microsoft/Google race and offers this tidbit about VE3D's future:

Fifteen cities already are searchable online. Microsoft will drop ads into the maps on computer-generated billboards. You'll be able to type "Starbucks (nasdaq: SBUX - news - people )" on your mobile while standing in San Francisco's Union Square and get a 3-D map guiding you to the nearest one. Microsoft acquired some of this technology in May when it bought videogame ad-broker Massive Entertainment.

While we keep looking at the mapping, we need to remember that the money comes from the advertising, not the mapping per se.