Mixing colors right

There is a big difference between just slapping random color on a page and looking good while you do it. This is a great set of tools to improve readability and color contrast, validation tools for image and links, even view your page in grey scale to see the contrast. This maybe more for a website but if you have templates you reuse it may be worth checking them with these tools.
http://juicystudio.com/services.php#localtools

More color scheme and accessibility tools here for the more advanced user http://uitest.com/