Google mostly returns Apple's accessibility API and other programming resources.
But I'd want to know, for example, what is Mac OS X version 10.7.4 equivalent of 'sticky key' in Windows.
Any other productivity tip for using OS X with only one arm?
In System Preferences, click Universal Access then Keyboard:
You'll find the options for sticky keys in there.
Something I find very useful when on one arm (and when on two) is these:
They're maybe more useful if you're using you left arm, since you can then do most of them with your left pinky on ctrl.
For adding custom commands I recommend BetterTouchTool.