BRILORMAC  While Shades does do the job, relatively speaking it is a resource hog.

For an app with no UI, it uses 28 to 29 MB of real memory ( as shown in Activity Monitor ). I have several apps with multiple window UIs with real memory usage at 8 to 10 MB. Moreover, the memory usage grows the longer Shades runs. This is a memory managements issues. See leaks below.

Also, the code is leaking memory. A quick analysis with the "leaks" command line tool ( via Terminal ) on the running Shades ( had been running for approximately an hour ) shows 37 leaks for 2432 bytes. This keeps accumulating the longer the Shades app runs. A similar analysis with Instruments confirms.

This doesn't make Shades a bad app, just one that needs improving ( the Finder in OS X 10.6.4 leaks too ). This would be a 5 star rating except for the leaks and bloated memory usage.  
(Version 1.2b3)

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)

GRIZZLY19  My eyes "say" thank to this program!

Really useful…  
(Version 1.2b3)

SHK747  perfect with 10.6.1  
(Version 1.2b3)

BERNARD SOFFER  Needs Leopard update to make it functional again.

1 Star now 'till its done, then back to 5 Stars no doubt.  
(Version 1.2b2)

PROKOS_J  I have been using Shades and recently discovered that it is interfering with the custom screen calibration on my iMac. Shades switches my custom calibration off even though it is selected in the Monitor Preferences. The only way to get my custom calibration to stick is to open Shades preferences and cycle it off. I am guessing it has something to do with the position Shades is loaded at system startup because this wasn't happening before.  
(Version 1.2b2)

UKNOWWHO  I followed discussion from apple.com and downloaded shades 1.2b, and boom my new iMac 24" is no longer that tiring bright. Good work!  
(Version 1.2b2)

ST00P!D M0NK3Y  This hasn't been updated in a year and is still in Beta. Did you guys drop the ball on this project?  
(Version 1.2b2)

OCHYMING  Do not know why or if it was the program.

But after running it, my keyboard started acting funny!

So I re-installed the previous version.  
(Version 1.2b2)

FRANCK GUADAGNINI  PERFECT!!!  
(Version 1.2b2)