WebGL browser based experimental demo turns Google Maps data into 3D cubic blocks. By Jaume Sánchez:
A representation of terrain, using cubic blocks to render google maps, with texture and elevation.
It shows your current location or a specific location, in different levels of zoom and sizes.
Links and other information can be found here
It is also worth checking out Jamie’s other online demos. Also, this was found via roomthily’s interesting tumblr blog, which I can fully recommend.