Sealed crisper drawers can help keep your fruits and vegetables at their best longer. Vegetables require higher humidity conditions while fruits require lower humidity conditions, which is why many refrigerators have two separate (marked) drawers. Some crisper drawers have controls that allow you to customize each drawer's humidity level.
An adjustable temperature meat drawer often has controls that allow you to adjust the temperature. It is ideal to keep meats as cold as you can without freezing them.
For more information about storing foods in the refrigerator, see Can Your Refrigerator Kill You?