The fun with Emacs is that you can discover new (or old) stuff that makes your life much easier on an almost weekly base. I was reading the manual on Emacs Speaks Statistics and discovered that there is a mode called auto-completion. I googled it, installed it and after some experimenting, I got it running. You can find it here. It comes with autocompletion for some programming languages (Python, Ruby, C+, etc.) but not for LaTeX, so I googled further and discovered an extension called auto-complete-latex (you can download it here.

Here are some screenshots: You just start