Some of the other similar apps are confined to a single screen, so the ability to pick from your multi-screen setup will be a useful option.
To pick a color, press Control+Shift+C (this can be changed in the configuration file if desired). Any color picked will be saved to the clipboard with its corresponding HTML code. For newer users, you can view your clipboard history by pressing the Windows logo key + V.
Color Picker was designed with designers and developers in mind but will be of use to anyone needing to pick out colors.