The Global Land Cover Characterization (GLCC) dataset is a collection of land cover classification schemes based on AVHRR data from April 1992 through March 1993. These data are available by continent or a single global coverage in either the Interrupted Goode Homolosine projection or in geographic coordinates (latitude/longitude). These data are available at the USGS Earth Explorer site.
The MODIS Land Cover Type product is a global land cover classification data layer produced annually from 2001 through 2013 (as of this writing). For each year there are five land cover schemes, developed by different research groups. Data are distributed by the USGS at 500m resolution in standard MODIS grid tiles. These tiles use the sinusoidal projection and cover approximately 1200 x 1200 km (~10° x 10° at the equator). The following USGS site has detailed meta data and download access: