In a mixing bowl, combine the sour cream, chipotle powder, and salt. Stir well.
Cover the bowl and place it in the refrigerator for 1 to 2 hours, to allow the flavors to meld.
Want less of a "smoky" spicy? Swap in sweet paprika. It has less smoky flavor, but also much less heat. You can also opt for cayenne pepper instead of chipotle. Cayenne has more of a neutral flavor, but much more heat (easily four times hotter). Start with a quarter of the amount called for when using cayenne if there is concern on the sour cream being too hot. To balance the heat and flavor, you can also use a mix of paprika and cayenne.