This project has been taken up in the official codebase of TikZ and pgfplots in a much improved manner (thanks to Stefan Pinnow). It is highly recommended to use that library, rather than the version hosted here.
This project provides the colour definitions introduced by the ColorBrewer project for use in TikZ and pgfplots.
Simply put the files in a directory where LaTeX can find your files. On linux,
for example, put these files in ~/texmf/tex/latex/colorbrewer/ (you might have
to create the directory). Then run texhash to update the definitions.
There are two example files display_colorcycle.tex and display_colors.tex
which illustrate the usage. The second example outputs a list of all colours.