Google Earth: Public Land Survey System

EarthPoint - Based in Idaho, this company utilizes Google Earth for the Real Estate Market in SW Idaho.
Township & Range - Utilities for viewing PLSS (Township and Range) locations on Google Earth.  Type in a specific township and range to fly to that location, or turn on township and range grid.  Zoom in closer to view individual sections.  Includes acreage and lat/long of center point.
Excel To KML - Export a spreadsheet of lat/long coordinates to Google Earth. Pop-up balloons, icons, and paths are easily created from the spreadsheet data.
Earth Point Blog - includes information on using the above two utilities, as well as others information regarding Earth Point and Google Earth in general.