Both the NASS Cropland Data Layer (CDL) and the National Land Cover Dataset (NLCD) released new versions in early 2014. Links for download are here:

• CDL:
  
  • Users NASS can download the 2013, 2012, 2011, 2010, 2009, 2008 CDLs; the 2013 confidence layer and the 2013 cultivated layer from National Downloads (file sizes > 2gb).  
  • View their latest presentations in .PDF format.
• NLCD:
  • The National Land Cover Database (NLCD 2011) is made available to the public by the U.S. Geological Survey and partners.