Here are some good bookmarks for color selection.

http://www.visibone.com/colorlab/big.html
216 color picker & some handy cheatsheets forsale. (They offer other great cheatsheets also)

http://www.w3schools.com/html/html_colornames.asp
List of the color names that are supported by all major browsers.

http://www.febooti.com/products/iezoom/online-help/online-color-chart-picker.html
Online color chart provides hex html color codes in very accessible format with a really neat preview/history option.

http://wellstyled.com/tools/colorscheme2/index-en.html
"Color schemes generator 2" Offline version available.

For those Subdreamer CMS users out there, did you know there is also a decent color chart available right in your admin panel?  The file is located in your admin panel as a file names colors.php but you can click your way to it in the Subdreamer admin panel itself under Languages > The first paragraph at the top has a link to the color chart.

Cheers