Bring a large stockpot of water to a rolling boil.

Meanwhile, heat a large saute pan to medium heat. Add vegetable oil, and saute the shrimp, carrots and ginger very briefly until the shrimp is almost cooked through, about 2 minutes. Note that the shrimp will continue to cook when you turn off the heat, so stop them before they are fully cooked. Put them aside in a bowl.

Place rice noodles in boiling water, and boil for 2 minutes. Drain into a colander and (for room-temperature salad), wash and rinse well with cold water. Mix ingredients in a large bowl. Garnish with cilantro and lime, and crushed peanuts.