As [among many things 🙂 ] a web designer/programmer, I need to know about colors! I need to choose main colors, keep with them until the project is finished, etc!
When doing the design you can just use GIMP’s color chooser but when coding, you sometimes need to test which color fits better.
I recently found gcolor2 (by Justin Spadea), a simple and useful tool for people who need to get/check/test colors without having to start GIMP.
gcolor will allow you to pick any color you’re seeing on your screen with an eyedropper or to choose colors from a GTK color wheel. Also, you can store colors for later usage and check the already saved colors with fancy names 😉
This is one of those little tools that make your life easier!