Luckily, I don't have to choose colors for a living. I wouldn't be good at it. Maybe as a result of my lack of skill, I am fascinated when I find a gadget that claims to help choose colors. Not that it makes it any easier for me really, but I like playing with the knobs and levers.
Here's a collection of color choosing helpers:
- Kuler from Adobe: very slick, with some social features.
- Wellstyled Color schemes generator 2
- SitePro Central Colour Scheme Chooser
- Color SynthAxis, I've written about before, came up with a different way to interact with colors, more of a color building set than a picker.
Other useful color stuff:
Colourmod is a color-picker widget you can embed in your own web application. It uses a clever transparent PNG trick to build a nice smooth picker.
Finally, if you are on a Mac, here's some tips on how to get the most out of the built-in color picker.