On Mac OS X you could give colors to the output of the "ls" command simply adding an alias:
# alias ls ='ls -G'
also you can show a / at the end of a directory name using the -p switch
# alias ls='ls -p'
you can use both these commands issuing the following command:
# alias ls='ls -Gp'
And you can start with this configuration inserting the above line into the "~/.profile" or in "~/.bash_profile" file.
Gg1