Good point about recycling, Gil, but I don't totally agree with you. If you break a fluorescent lamp, then clean it up, you obviously shouldn't put your pet somewhere near that area for a while. Who in the right mind would let their pets near a mercury spill?
And besides, after a few hours of letting the room ventilate after you cleaned up the broken lamp, the mercury threat should be gone. And as long as you're careful with CFLs, the chances of you breaking a CFL aren't likely. And yes, CFLs WILL do you good. They reduce CO2 released in coal power plants (so even though a CFL contains mercury, it reduces pollution in the long run), most CFLs produce the same amount of light that incandescents do, and they last MUCH longer. The way I see it, the benefits of CFLs outweigh the potential hazards that COULD happen (which can be prevented if you handle them with care).