Here is a short video on choosing a CFL.
I can expand on this video with the thought that there are now an ever changing variety of CFLs coming on the market, for every kind of lighting application. You may now choose CFLs for ceiling fans, (which are totally different than ones you would choose for a standard lamp or light fixture) they need to be able to withstand the vibration a fan puts out. There are also may new shapes of CFL’s coming out to match almost every incandescent version on the market, such as vanity bulbs(globe shaped)and candleabras for chandeliers (flame tip). Also, be VERY aware that not all CFLs can be used outdoors in extreme temperatures or with dimmers or timers.