Windows 7 Tip: 
Name that color is free web utility tool, which help you to find code of of all those colors which are you looking for.
Select a color in the color picker to see what its rightful name or code is. Paste in a color HEX and look up the name of that rogue color in your CSS file. Or, if that is too complex for you, select the color you want to view by using the handy drop down. It is all here and all dirt simple.
You can also select from the dropdown list of 1500+ colors and then play around. This web utility is very useful to pick the colors codes. Try it here - Name that Color
Now, I was really looking for something like this. Atleast, now I won’t have to open Photoshop everytime, when I want to find the color code for any color. Thanks a lot for sharing.
Yes Haris this one is best utility to find the color names