HSV and RGB color selectors
If anyone doesn't have photoshop or the Gimp, or doesn't want to bother opening them up (because they take up so much system resources), and doesn't use IE….
I programmed some JavaScript color selectors. One based on the Red-Green-Blue channel model, which will help you understand how web colors work if you play around with it, and another based on the Hue-Saturation-Value model, which is much more intuitive.
Works in Firefox, Opera, Shiira and Safari; doesn't work in IE. If you test it in other browsers, go ahead and let me know.