USDA just announced an update to their instance of GRIN-Global, the genebank data management system, where you can explore the holdings of the U.S. National Plant Germplasm System at your leisure. From there the data finds its way to Genesys, where you can compare US holdings with those of other contributing genebanks. Perhaps the most significant change is the resurrection of the Crop Wild Relatives search page, a monumental resource.