Doing web design stuff has changed a bit for me in the last year or so. I used to use Dreamweaver and Fireworks quite frequently, but since dealing with more CSS and dynamic content, I've moved to a sort of combination approach. I usually start in Fireworks to get an idea of how a page might look, then I try and duplicate it with stylesheets. These days I use Dreamweaver primarily for the code view and site management - not to create pages.

In the case of dynamic sites, I often find it easiest to edit the css online (via the templates in MT or the filebrowser in pMachine), which means that this brilliant Color Wheel that Rogi found is very handy indeed.