Ive replaced, over time, most of the lighting in the house with CFL bulbs. The exceptions being appliance bulbs (fridge, stove) and decorative globes in the bathroom.
Just a friendly FYI on the subject --
Don't toss burned out CFL bulbs in the trash and, if you break a CFL bulb, don't use the vacuum to clean it up.
Compact fluorescent bulbs require careful disposal