I didn't find a good
LaTeX color reference while googling, so I made my own short color overview.
By default there are 6 colors available within LaTeX:
red,
green,
blue,
cyan,
yellow and
magenta (as well as the "non-colors"
black and
white).
By using the
colors package, another
66 colors become available. You can then use these colors to colorize some pieces of text or - more practically - change the colors of the links generated by the hyperref package.
Rafael: Thank you very much, I was having a huge headache to solve the very same problem!