'Taglist: Exuberant ctags (http://ctags.sf.net) not found in PATH. Plugin is not loaded.'
To remove this you have to install ctags which you can download from http://ctags.sf.net.
After you unziped it, you have to set the Tlist_Ctags_Cmd variable in the .vimrc file to point to the ctags folder.
let Tlist_Ctags_Cmd = '/usr/local/bin/ctags'
After that you have to restart vim and the message should not pop up again.