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They save energy.
They last a long time.
They are one of the easiest things you can do to "green-up" your home.
Their use is mandated by the US Government

They contain Mercury.
They require special clean-up procedures.
They shouldn't be thrown in the trash.

 

I'll be everyone knows that compact fluorescent lights (CFLs) are the first four items.  But probably very few know that the last three also apply.  The EPA has mandated their use, however not much is publicized about what to do if they break or how to properly dispose of them.  I'm sure it's written on the box in fine print somewhere.  Now if I could just find the box it came in. Hmm.

Actually, the EPA web site has some good info.  See What to do if a CFL breaks for more info.