this is my first post here,
congrats for Cesium it is absolutely great!
Hi was training to learn how to visualize a "ground overlay" using cesium using as input a geotiff image 
i was using the google earth plugin before and for that purpose i was generating a kml ground overlay
for that purpose i was generating the tiles using gdal :
gdalbuildvrt filename_tmp.vrt filename.tif
gdalwarp -of VRT -t_srs EPSG:4326 filename_tmp.vrt filename_geo.vrt
gdal_translate -of vrt -expand rgba filename_geo.vrt filename.vrt
gdal2tiles.py -p geodetic -k filename.vrt
the generated kml is available here 
can you please help me to get started ?
what i'm looking for is a sample html code that load a Cesium globe adding the image  as overlay.
i'd love to see cesium running on the osgeolive
next i will work on an overview and quick start, any help/contribution will be great
many thanks for your precious help!