I really like these. Spotted over on Crunchgear. These rubber skins fit over your keyboard and have colour coded shortcuts and functions printed on them. Unless your using the same app every day then you will never remember all the shortcuts so at $30 for a laptop skin and $40 for a desktop one I think they are a bargain for the multi digital user; and they also keep your keyboard clean! One note, these are US layout covers but I guess you could set up a keyboard preferences to handle this. Purchase them here but there is no mention of international shipping, shame.
Apple and Application Specific Keyboard skins