Spatial Dynamics

An interesting open-source database of cell-tower identifications and locations can be found at OpenCellID.org. This project currently has over 90,000 records and it aims to create a complete database of worldwide Cell IDs.
Although the coverage is very limited, as it grows, it should provide a crowed sourced alternative to proprietary databases such as Skyhook and [...]

A unique site that combines multiple spatial datasets is San Francisco-based MapJack, a sponsor of the Where 2.0 Conference. Unlike Google Street View, MapJack has more of a sharp, immersive feeling. Although it has fewer coverage areas than Google Street View, it also includes walking areas such as parks.

Founded in June 2007, MapJack is a [...]