King's College Geodata portal
There are a number of new datasets making use of Google Earth/maps on the new King's College Goedata Portal:
http://www.kcl.ac.uk/schools/sspp/geography/research/emm/geodata/
Visualising land cover changes in this way could be extremely useful for rapid conservation assessments. In particular check out RALUCIAPA, Conservation-Eye and Terrascope.
Be warned - they were running very slow last time I checked.