I used to live at several thousand feet above sea level, but now I live only a few hundred feet above sea level. Will this affect the temperatures and times in my baking recipes (cakes, breads, etc)? If so, how? Does a change in altitude affect any other areas of cooking?
Usually this question goes the other way around (how to adjust recipes for high-altitude cooking)...
The main effect that altitude has on cooking times and temperatures is how it affects the boiling point of water. At higher altitudes, water begins boiling at a lower temperature, so anything boiling will not reach as high of a temperature, and often needs to be cooked longer.
Higher altitudes can also cause leavening to have a greater effect. You may need to add extra leavening (yeast, baking powder) to get the same amount of rise that you had at a higher altitude.