http://www.youtube.com/watch?v=94KzmB2bI7s Cool experiment that uses speakers to lift things.
http://ransom.redjar.org/ All of the USGS topographical maps were bought by this guy and were sent over to the Internet Archive so soon you shall be able to download them for free. Check back for updates. This is cool.
http://mcmcweb.er.usgs.gov/drc/dlgv32pro/ USGS mapviewing software.