LCD Displays Use Less Energy

As a rule of thumb, LCD's generally use around 1/2 to 1/3 the energy of an equivalent CRT monitor - some sources peg the energy savings at around 60% on average. The Samsung super slim profile, slim bezel 172x 17" LCD for instance consumes 40W, while an equivalent 19" CRT monitor like the Samsung 955DF or the Viewsonic P95f consume around 100W. If you use your monitor at home 10 hours a day, you'd save about $20 a year on your electricity bills alone.
Even in standby mode an LCD will consume less energy than a CRT - LCD's use around 3 watts while CRTs can consume 5-8 watts in standby.

Other things to take into consideration: There is less heat polution from LCD's - in summer this might mean your overall heat output from your computers is lower, which means you spend less on air conditioning.

LCD's emit fewer harmful radiation

CRTs emit VLF and ELF (Very Low Frequency and Extra Low Frequency) electromagnetic radiation (caused by the scanning electron beam in the CRT tube), while LCD's do NOT. These EM emmissions are considered by many to be harmful to health.

Discarded LCD's have fewer harmful ecological chemicals

Regular CRTs have lots of glass, mercury and lead which, when disposed of incorrectly, is very harmful for the environment. LCD's have a higher cost of production but they also have fewer such problems when being discarded.

LCD's have better contrast, and require less ambient lighting

Because LCD displays are more visible even in slightly lower ambient lighting conditions (with fewer of the fatigue problems associated with CRTs), you can potentially save energy on lighting costs while using LCDs.

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