Something to consider.
Most of the following information was cut and pasted from a website, which has been my general experience with CFLs. I'm down for saving energy, but as Capt. Jeff says, "is the juice worth the squeeze?"
Most CFL's contain about 5 mg of mercury. They are supposed to be disposed of as hazardous waste, but there is no program to take them. (Home Depot does have a collection point and the bags to discard the used CFLs.)
They need a careful cleanup procedure if you break one.
If you use them in an enclosed fixture, or base up in the ceiling, the electronics get hot, and its life is reduced. I couldn't find out by how much.
There are many manufacturers, and you can't tell how long a brand is going to last, or how it reacts to heat or on/off cycles. You need to trust, or you can always pay more for a higher quality CFL.
They are somewhat longer and wider than a regular bulb, so they don't fit everywhere.
Many CFL's, especially the $5 ones, have a slow start-up. It takes them 30 seconds to 3 minutes to fully light up. If you use them outdoors in the cold, some of them never fully light up, or they don't start at all.
You can't use the cheap CFL's with a dimmer, but there are some that will work.
CFL's are fluorescent. Some people get headaches from the light, or they see the 60 cycle flicker and can't read by them, or they hate the color of the light, or they hear a faint buzz.
CFL's get 20% dimmer as they age toward failure.
Some people never need to go to the tanning salon again after a complete change out of bulbs.
A house has many bulbs that are almost never used. It makes no sense to place $5 bulbs in those locations, rather than a $.50 bulb that will last for 5 years anyway.
If you must choose between two evils, pick the one you've never tried before.