Helsinki - Open Data

Helsinki is one of the most open cities in the world for the sharing of data to citizens (and others)

Datasets are shared along with imagery and other information about the city.
Here's a link to take a look at them.

One of the exciting developments that has grown from this is an experiment in navigation for blind and partially sighted people using technology.
More on this to come as I get further into the D3 ERASMUS project.