Slice the potatoes as Welfarite suggested, use the One-calorie spray (Fry Spraylite? Just can't remember the name) and bake them in the oven - crispy and no added fat! Sprinkle with paprika for that extra bite! Yum!
It's the worst kind of fat...saturated! If you spray some of this product onto a cold pan you'll see it dries solid by the next day. You might as well use dripping. Olive, sunflower or safflower are best.