Log on to these websites, to see whether the kind of spatial datasets that you're looking for is actually available:
GIS Geography
A blog on everything about GIS.
Natural Earth
For basic geography data (coastlines, lakes and rivers)
Atlas of the Biosphere
For land use, ecosystems, and water resources
NASA/GSFC Rapid Response
For satellite imagery of the earth
FAO Geonetwork
Spatial data depository by FAO
GeoCommons
"Probably largest source of GIS data. Most datasets are user-submitted, hence be careful about data quality" according to Robert M. Gonzalez
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