They're too sour to eat without some sweetener, but you can buy dried cranberries sweetened with sugar or fruit juice. Fresh or frozen cranberries are best used in recipes like Cranberry Stuffed Acorn Squash.
"Cranberries, raw." USDA National Nutrient Database for Standard Reference. Accessed November 28, 2010. http://www.nal.usda.gov/fnic/foodcomp/search/.
"History of Cranberries." Cape Cod Cranberry Growers' Association. Accessed November 28, 2010. http://www.cranberries.org/cranberries/history.html.