Tile5
Most of us will continue to use the big mapping libraries for standard jobs like showing street addresses. But what if you want to do something different, like change the rendering or fiddle with layers in ways the big libraries don't allow? Tile5 can pull the mapping tiles from such sources as GeoCommons, then lay them out so that the user can shove them around just like the maps from Google, Mapquest, or Yahoo. But there are other opportunities: The animation operation can change any of the parameters of the display. This is usually used for panning across the map and landing in one spot.
