Emacs is distributed with printable reference cards.
A file, `refcard.tex’ (and `refcard.ps’ in PostScript format), which gives most of the keybindings for basic editing.
If you do not have access to TeX or some sort of PostScript interpreter like GhostScript?, then http://refcards.com/ has PDF versions of this, an XEmacs card, and one for AdvancedDeskCalculator as well.
An alternate Emacs reference card is available at http://www.mitchr.me/ as a PDF file.
I generated an Emacs 22 reference card from refcard.tex. Available at http://marc-abramowitz.com/archives/2006/04/10/emacs-22-reference-card/
Emacs 23 comes with a number of refcards, in tex and pdf format. Most of them can be located from inside emacs with M-x locate refcard. These cards are meant to be printed and folded so as to provide a quick reference sheet to the most common shortcuts of emacs and its extensions.
refcard.pdf -- english fr-refcard.pdf -- french de-refcard.pdf -- german pl-refcard.pdf -- polish ru-refcard.pdf -- russian cs-refcard.pdf -- czech pt-br-refcard.pdf -- portuguese
survival.tex -- another reference card for emacs (2-fold) dired-ref.pdf -- reference card for dired calccard.pdf -- reference card for calc mode orgcard.pdf -- reference card for org mode gnus-refcard.pdf -- reference card for gnus gnus-booklet.pdf -- extended list of shortcuts for gnus vipcard.tex -- reference card for VIP, also known as vi-mode vipercard.tex -- reference card for viper mode tex-ref.pdf.gz -- reference card for auctex
Other refcards include {fr,sk,cs}-dired-ref.pdf, {fr,sk,cs}-survival.tex.