Here are some examples of the use of MapBuilder. Please feel free to add links to your favorite sites.
GeoConnections Discovery Portal is a search engine for the discovery of, and access to, geospatial data and services. Also create your own maps using the Web Mapping Tool based on the MapBuilder Context Editor demo.
Humboldt Bay Atlas Providing information about the Humboldt area on the North California Coast
Humboldt Bay Atlas with Layers Allowing more advanced analysis using multiple selectable layers
Edugis Educative GIS portal Dutch website to introduce highschool students with GIS