Haven't tried CFLs (Compact Fluorescent Lightbulbs) yet? Would you give one a shot if it were free?
You'll have your chance this Sunday. Home Depot has earmarked one million CFLs for giveaway in observance of Earth Day. The offer is open to U.S. customers in the 48 contiguous states.
Lighter Footstep - Want a free CFL for Earth Day?