We have two great new projects showcased on the Cesium website:
GeoPort 3D is a front-end web application that allows users to interact with archived satellite imagery on GeoRepository, enabling them to quickly view large imagery sets and pick images for server-side processing and user inspection: http://cesiumjs.org/demos/GeoPort3D.html
Shakefinder displays USGS earthquake data, with colored boxes indicating the magnitude of earthquakes: http://cesiumjs.org/demos/ShakeFinder.html