The US Geological Survey just announced that it will release its entire archive of Landsat data over the internet at no cost during the next year. Full global coverage of Landsat 7 will be available by July 2008 and all historical Landsat data will be released in stages, to be completed by February 2009.
I’ve posted the official announcement if you’d like more details at http://www.public.asu.edu/~cmbarton/files/info/USGS_landsat_release.pdf
Michael
Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University
phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton