Interactive Mapping Resources

For those of you who are as fond of maps as I am, take a look at these free, interactive mapping resources:

Maryland with distance and area measuring tools and with many layers including park areas, roads and rails, some outdated topographical features, and even some high altitude photos.

Google Earth is the next best thing for those of us who will never be an astronaut. The imaging and layers are truly remarkable. Have fun with the 3-dimensional features and the map tilting capabilities.

Windows Local Live (Virtual Earth) has excellent imaging and strong interactive features as well, such as pushpins, and a truly amazing "bird's eye" view.