Jeff Segars pointed out a nice little application to me called xScope. It is a collection of utilities that allow you to get information about things on your computer screen. Among those utilities are:
I have particularly found this application helpful in my front-end coding.
Keep in mind that, if you want to use xScope to capture the color values within a Photoshop document you will need to do the following in Photoshop:
Failure to do so will cause Xscope to read to color values which PS has biased according what is entered in its "Color Settings" dialog box.
Any Windows equivalent ?
;)