You know I'm big into free data, so here's a reminder about a cool data initiative from the USGS, coming soon - From http://landsat.usgs.gov/ here is something that may be of interest: A reminder, this came out of the USGS [see news] on April 21, 2008 - Imagery for Everyone By February 2009, any Landsat archive scene selected by a user will be processed, at no charge, automatically to a standard product recipe and staged for electronic retrieval. In addition, newly acquired scenes meeting a cloud cover threshold of 20% or below will be processed to the standard recipe and placed on line for at least three months, after which they will remain available for selection from the archive. Details can be found in the USGS Technical Announcement - .pdf (66.8 KB). See more here or For further information on Landsat satellites and products, see http://landsat.usgs.gov
Speaking of imagery, the USGS has just released this RFI -- the DOI seeks information and capability statements for a "Satellite Ground Station Services for the Landsat Data Continuity Mission (LDCM)."