This is a tool that is meant for Windows web designers and programmers, but these days, bloggers who support their own blogs in WordPress, for example, are doing a lot of their own site modifications. Color Cop stays on top and includes an eyedropper to grab a color of interest off any web page. It lists the colors in RGB and hexadecimal. Another cool thing Color Cop includes is a complimentary color palette for any chosen option. Nice for experienced users and rookies, as well.
Photo Credit: Color Cop