Chipstix Articles - Potato nutrition

Nutrient	Without skin (156 g) (% RDA)	With skin (173 g) (% RDA)
Vitamin C	33	28
Thiamin	11	7
Niacin	11	12
Vitamin B6	23	27
Folate	4	12
Pantothenic Acid	9	7
Iron	3	10
Magnesium	10	12
Potassium	17	26
Copper	17	10
Dietary Fiber	9	15

Source: http://en.wikipedia.org/wiki/Potato#Nutrition