Yellow Snap Beans are edible pod beans that have lots of vitamin A, and potassium, as well as a fair amount of vitamin C. They are low in calories, about 30 per cup of cooked snap beans.  Most modern beans are now stringless. Choose slender, crisp, bright yellow beans that have a bright color and no blemishes or soft spots...avoid those with large swollen seed pods as these are more mature and woody and less flavorful.

Allow 1/4 lb. per person. Store Yellow Snap Beans in the refrigerator for no more than 4 days, unwashed in a plastic container or bag. Beans can be sauteed, steamed, boiled and microwaved. They are wonderful in stir fry dishes, and of course Mom's casserole.

Here are some good  Bean sites:

http://www.produceoasis.com/Items_folder/Vegetables/GrBean.html