There are lots of Emacs reference cards out there online, but I couldn’t manage to find one for Emacs 22 (the latest development version) in a couple of minutes of web searching so I generated one from the TeX source file that comes with Emacs:
tex /sw/share/emacs/22.0.50/etc/refcard.tex dvips -t letter -t landscape -o refcard.ps refcard.dvi ps2pdf refcard.ps
For people who had trouble opening the PDF in Adobe Acrobat, try this PDF and let me know if it works. I used ps2pdf14 to generate it, which spits out a newer version of the PDF standard, which perhaps Acrobat can deal with better. I also uploaded a PostScript file and a DVI file, in case one of those works better for people. If you try them, please leave a comment below and at reddit.