CFL Bulbs Have One Hitch: Toxic Mercury
“But the bulbs contain small amounts of mercury, a neurotoxin, and the companies and federal government haven’t come up with effective ways to get Americans to recycle them.”

“Experts agree that it’s not easy for most people to recycle these bulbs. Even cities that have curbside recycling won’t take the bulbs. So people have to take them to a hazardous-waste collection day or a special facility.”

Exposure to Mercury From Fluorescent Light Bulbs
“The diagnosis was mercury poisoning, and an investigation of his environment disclosed that he had been exposed to mercury from broken fluorescent light bulbs.”

I also found some articles that attempted to minimize the risks of CFL’s, but they seemed to be primarily from companies that sell CFL’s. I would advise educating yourself on the pros/cons of CFL’s prior to using them.

While reading some of the articles, I came across Dimethylmercury (not in CFL’s). This nasty neurotoxin was responsible for killing a researcher who accidentally spilled a drop or two on her latex gloved hand! Absorbing a thousandth of a milliliter is fatal.