Use showerhead flow restrictions. You will use about half the water for showers, and you will hardly notice a change in water pressure.
Lower the thermostat on your dishwasher. 130 degrees Fahrenheit is an efficient and sanitary setting (check your owner's manual if you have a dishwasher). Lowering water temperature from 140 degrees to 130 degrees can cut your hot water costs up to 15%.
Use cold water when you can. For example, lightly-soiled laundry cleans fine in cold water.