It feels so good to make this small change in our house. We just replaced every recessed light in our entire house with CFL's (compact fluorescent lamps) today. Home Depot has a whole section dedicated to CFL's and Puget Sound Energy has $3 coupons PER BULB!!!
So if you buy a two-pack, use TWO coupons, saving $6. Woo hoo! Since we bought mostly small and large flood lights (for the recessed cans) which are sold in 2-packs, this was a fantastic savings! We also bought CFL's for our master bathroom's vanity strip of lights... Fluorescent lighting and makeup typically don't mesh well so we'll see how that goes... :)
The 4-pack for standard light bulbs (like lamps & things) had a separate 4-pack coupon that was different from the others.