Polymaps is a javascript library for making dynamic, interactive maps in modern web browsers.

polymaps provides speedy display of multi-zoom datasets over maps, and supports a variety of visual presentations for tiled vector data, in addition to the usual cartography from openstreetmap, cloudmade, bing, and other providers of image-based web maps.

because polymaps can load data at a full range of scales, it's ideal for showing information from country level on down to states, cities, neighborhoods, and individual streets.

polymaps also uses svg (scalable vector graphics) to display information: for this reason you can use css rules to define the design of your data.