PHLOEM This supports multiple screens separately! I have an older Apple ADC cabled 20" Cinema Display connected to my MacBook. Now I can control dimming the extra display! Since having to use the ADC-DVI adapter, the dimming feature was lost.
Shades give you simple customizable settings separately for each display (menu icon or not, floating bezel or not, optional hot keys. All for free.
The only feature I would add is the ability to put the display to sleep (and sleep only one display).
(Version 1.2b3)