Removing an Item from Magento's Admin Panel Navigation
Cleaner way to do this:
Add a adminhtml.xml (e.g. to an existing modules that keeps all other customization stuff, or create a new module)
<?xml version="1.0" ?><config> <menu> <xmlconnect> <disabled>1</disabled> </xmlconnect> </menu></config>
You could inject a bogus module dependency into the menu item in your config.xml.
In your case,
<adminhtml> <menu> <cms translate="title" module="cms"> <depends><module>HideMe</module></depends> </cms> </menu></adminhtml>
I don't think Alan would still need anyone to ask this question, but for anyone else that might end up reading this, it would be a bit better to use:
<adminhtml> <menu> <cms translate="title" module="cms"> <depends><config>some/configuration/flag</config></depends> </cms> </menu></adminhtml>