Do use CFLs in a location where they will be on for at least 15 minutes.
Do use CFL's specifically designed for use in ceiling fans which are made to withstand the high vibrations caused by the fan. This will prolong the bulb's life.
Do use dimming CFLs with a dimmer switch.
Do use CFLs specifically designed to withstand heat in recessed cans.
Do use only CFLs with a UL rating that are specifically designed to withstand wetness during outdoor usage.
Do use CFLs timers such as mechanical timers (e.g. the inexpensive dial type timers).
Do properly recycle CFLs to ensure that no mercury gets into the environment and to help reduce energy consumption.
CFL DONT's
Don't use a CFL in a location where the lights are turned on and off frequently.
Don't Don't use a CFL in closets, for instance, which are less than ideal for CFL applications since the light is turned on/off frequently.
Don't use standard CFLs on dimmers. It will significantly shorten the life of the bulb.
Don't use regular CFLs in high temperature environments.
Don't use regular CFLs with motion detectors.
Don't use a CFL on electronic timers, which will reduce the lifespan of the bulb.