UPDATE: This command is now included in standard preset configurations of VC, so you may already have this in your command tree.
Can't remember how to say a command? Can't remember if you even have a particular command?
I find the following voice command indispensable. It opens the same html page of voice commands as when you go to Help > Build Voice Commands.
Super basic, but you may not have noticed the Help.ShowEnabled action.
<?xml version="1.0" encoding="utf-16"?>
<command id="542" name="Show help" enabled="true" alwaysOn="False" confirm="False" requiredConfidence="0" loop="False" loopDelay="0" loopMax="0" description="">
<action>
<cmdType>Help.ShowEnabled</cmdType>
<cmdString />
<cmdRepeat>1</cmdRepeat>
</action>
<phrase>Show me help, show help, show my commands, what can I say</phrase>
</command>