Module to banish modules, themes, and more so they can't be installed and don't even show up in the UI. [More to follow]
Example: Remove PHP Filter module
Say you want to make sure the php module is never turned on. Simply add the following to an enabled modules info file.
banish[module] = php
You may need to clear your caches first, but the result is that the php module no longer shows up in the list of modules. If you try to enable it via drush, your request will be rejected. If the module is on, it will be disabled and uninstalled.