Download FloatColorPicker 1.0 Free for Everyone! Mac OS X 10.4 or 10.5 (Universal Binary)

Features:

• Define RGB colors with components ranging from 0 to 1, rather than from 0 to 255
• Copy formatted component values to the clipboard, with or without the alpha component... "(1.000, 0.5020, 0.0000)"
• Amaze and delight your friends and family
• Planned: Predictive color rectangles like the built-in RGB picker

Installation:

• Place the downloaded file in your ~/Library/colorpickers/ folder.
• Note that sometimes the download shows up incorrectly as a folder, rather than a bundle. Placing the folder in the appropriate location should work just fine

Thanks to HexColorPicker for ideas and inspiration.