Vectors has a number of projects viewable online, the most interesting from a mapping perspective being Hypermedia Berlin. The user can select from a number of historical and urban development maps of Berlin to zoom and pan around the city. As well, a number of geographic locations are hotlinked to pop-up windows that provide images and historical information on the feature of interest. Unfortunately, the project takes a long time to load and seems a little sluggish when switching maps.

By way of Great Map.