git clone 'git://github.com/monsanto/readline-complete.el.git'
I find it particularly annoying that Emacs shell buffers do not offer satisfactory completions, but xterm does. I even used ansi-term for a while because of this (oh god). What I really wanted was for Emacs to show completions via auto-complete.el, like every other mode I use often. This package hopes to deliver on that promise.
Installation and more info: see .el file.