Everything you need to know to master VIM, a free vi clone running under various platforms. The VIM Quick Reference Card is released under the GNU GPL (General Public Licence).
This is a reference card for zsh. It was created based on version 3.1.9 so is a little out-of-date. It is seven pages long, even with three columns per page, so you will need a very big piece of card to stick it to.
A. Brodsky, S. Henshaw, and J. Whittle. RecSys '08: Proceedings of the 2008 ACM conference on Recommender systems, page 171--178. New York, NY, USA, ACM, (2008)