Global Land Cover 2000
Was available at "http://bioval.jrc.ec.europa.eu/products/glc2000/glc2000.php" (link broken as of 9/27/2015) as a 35 MB file that uncompresses to a 650 MB file. Each pixel is 1/112 degree in size, about 1 km. There are also smaller files covering a continent or portion of a continent, but these might use a slightly different classification scheme. You must place the files in C:\mapdata\indexed_data\LANDCOVER\GLC-2000 and unzip. Your choice for format should be TIFF, then ESRI, then IMG. ESRI and IMG will require using FWTools (GDAL). You should probably subset the file immediately to cover just your region of interest.
It has 23 categories.
Introduction to Landcover, and other sources of landcover data.
GlobCover 2009 and 2006 (300 m resolution) might be a better alternative.
Last revision 6/30/2014