Reading Usable Help
@UsableHelp on Twitter
Gordon R. Meyer
Crowdsourced keyboard shortcut reference guides
As I've previously observed, keyboard commands are popular among intermediate and advanced computer users, but nobody provides documentation for them anymore. Two Mac products have interesting, but different, solutions to this problem:
Dashkards uses Dashboard to provide tables of shortcuts that are instantly available. A large number of pre-defined cards are available at the site. However, since it is using Dashboard, you can't keep the reference table onscreen while you use an app.
Cheaters utilizes a little-known Automator feature to provide a floating window that displays any HTML or image-based reference file.
See also: Keyboard Reference On Demand.