Bind Ctrl+Left to backward-word (likewise Right) 

Binds some additional sequences to (emacs-)backward-word and
forward-word. The problem is that terminfo doesn't know about
Ctrl+ArrowKeys, so one has to resort to using raw sequences. The
sequences were copied from Debian's /etc/inputrc (readline
configuration), so it should be fairly portable. It works in xterm
and rxvt terminals, it doesn't work on TERM=linux (virtual console)
as Ctrl+Arrows send the same sequence as Arrows alone.

http://zshwiki.org/home/zle/bindkeys
http://sources.debian.net/src/readline6/6.2+dfsg-0.1/debian/inputrc?hl=44#L44