Looking for a list of tools and if you have time why you like them. Comparisons of tools would be really great. If all goes well, eventually, this could be a wiki we can point others too.
I use few tools.
ColorSchemer Studio 2 (currently $49.99 US). I like this for the ability to save my selections.
Color Scheme Designer online tool
There are a ton of colour-scheming tools, both online and offline. Here is a compiled list of them, but depending on your needs, some might be better for you than other ones. There is a screenshot that leads to the website with more information.
Here's a link to the blog post : http://tutorialblog.org/30-color-scheme-tools-websites-for-designers/
For windows I liked Color Impact a lot, the site has good color scheme information resources too, but now I'm on OSX I use:
and as a plug-in for OSX color picker I like:
which links with Kuler
which turns the color picker into a color schemer
Before jumping into tools for colour schemes, your first thing to learn is colour theory in general. Learn why and how colours work. There are plenty of resources on the web. Start with wikipedia and go from there. http://en.m.wikipedia.org/wiki/Color_theory?wasRedirected=true kuler.adobe.com is a good resource