ta for the explanation and yes, whilst simple to point at the nice nasa link, 'tis good to be able to explain it oneself :)

I did think that any orbit could be "geosynchronous" in terms of staying over a fixed spot on the Earths surface, at the expense of fuel to make it stay there...


Need a satellite refulling station for all those geoSynchronous satellites using up (albeit) small bits of fuel (hydrazene?) for station keeping. Opportunity for Esso? - may not be as cheep as 1.30euro/litre though!