If you enjoy creating fun, interactive maps, you'll get lost in the latest functionality from UMapper (our UMapper mashup profile). With it, you can include any image--even one that isn't a map--in its Flash viewer.
Founder Andrei Taraschuk shows off the feature in this video (embedded below):
You can add shapes, markers and media to the image, which users can then explore. In the case of this new feature, the images are not georeferenced. In other words, you cannot programmatically add elements to the page using latitude and longitude coordinates. That's not entirely a drawback when it comes to mapping Middle Earth, for example.
Embedded below is a "map" I created in order to test out the feature using any image. Using this photo of Portland's skyline, I outlined a couple iconic buildings using polygons.
The UMapper blog post has many other examples of maps created with the new feature.
All the old features of UMapper are there, as well, which includes six different map tile styles to choose from (including Google and Bing) and the option to make your map into a GeoDart game.