VIM: updating ctags file automatically

Most VIM developers use ctags for browsing the code. It is quite annoying to refresh the tags manually though. I forget to do this all the time – and suddenly navigation breaks.
Recently I have stumbled upon a great VIM plugin, simple and brilliant: AutoTag, http://www.vim.org/scripts/script.php?script_id=1343. This little thing updates your tags automatically on each buffer [...]