Much better website and the two interfaces to look for data are much better. However, the question or accessibility to cost eludes me. From the information in Sarah Parcak's book it could range from nothing to $600. The search tool on the Landsat website seems to make no reference to cost and on at least one page (http://pubs.usgs.gov/fs/2010/3026/pdf/FS2010-3026.pdf) there is a disclaimer stating "All USGS Landsat data acquired from 1972 to the present are available over the Internet at no charge and with no user restrictions." So it seems possible.
Accessing Data
The two different interfaces one can use to access the data are much better than those for MODIS and ASTER, though I think you can use them and I really should. Glovis (http://glovis.usgs.gov/)and EarthExplorer (http://edcsns17.cr.usgs.gov/NewEarthExplorer/) are graphical so you can look at the images you want to download. Although there is sort of odd coverage of places. I also think I need to register to download stuff directly. But much better than ASTER!
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