All users should upgrade to the 2003-08-07 release of this package. It features a much-improved indent/ruby.vim, and a standard informative header for each file.
Coming soon: matchit support for ftplugin/ruby.vim.
Put the cofigurations you want to be "default" in your vimrc. That's ~/.vimrc on Unix, or $HOME\_vimrc, on Windows (or a few other places; see :help vimrc).
Other settings you should put in there:
filetype plugin indent on
filetype plugin on