Riporto da Freegis-list
> Free geospatial datasets available online :
> - 15 meters Digital Terrain Model
> - 15 meters Orthoimagery (visible to thermal infra-red)
> - 15 meters Ortho-anaglyph imagery
>
> Product website : http://www.orthocoverage.com/
> Download area : http://www.orthocoverage.com/download/
>
> COUNTRY (number of datasets) : ALGERIA, BOLIVIA (2), CHINA(1), EGYPT
> (1), ETHIOPIA (1), IRAN (4), MADAGASCAR (2), MAURITANIA (2), MOROCCO
> (1), MYANMAR (1), SYRIA (1).
>
> Feel free to download and use without restrictions. Enjoy !
peccato non ci sia l'italia... 
risorsa originale:
http://intevation.de/pipermail/freegis-list/2007-June/003210.html