Exit signs
Because exit signs are always on, they should definitely be on your list of projects to reduce energy consumption. Old-style exit signs are lit with incandescent bulbs; you’ll know them because they feel hot to the touch. One option is to retrofit the sign with CFL bulbs. Other options include installing LED lights using a retrofit kit, or replacing the sign altogether with an LED one, which can save 90% in operating costs. BC Hydro estimates that each changed sign can save over $25 of electricity per year.
More information on exit signs available here.