vicheat sheet using JQuery on the Tools section of my web site. It is based on a really good cheat sheet that is linked at the bottom of my page. I just added some style changes, reordered it and made it expand or collapse sections.
If I can find the time, I'll try to make a offline version of the cheat sheet using HTML5.
Update 2/23/13: A reader also recommends this PDF cheat sheet: http://tnerual.eriogerg.free.fr/vimqrc.pdf