Remove the RME Fireface driver and apps on Mac OS X

Just send all the files listed below to the Trash.

FireWire
/Applications/Fireface Mixer
/Applications/Fireface Settings
/Library/Audio/MIDI Drivers/Fireface MIDI.plugin
/System/Library/Extensions/FirefaceAudioDriver.kext
/Users/username/Library/Preferences/Fireface folder
/Users/username/Library/Preferences/com.rme.FirefaceMixer.plist
/Users/username/Library/Preferences/com.rme.FirefaceSettings.plist

When using the new Snow Leopard driver also delete:
/Library/LaunchAgents/de.rme-audio.firefaceAgent.plist

Update: Newer drivers have these entries:

USB
/Applications/Fireface USB Mixer
/Applications/Fireface USB Settings
/System/Library/Extensions/FirefaceUSB.kext
/Users/username/Library/Preferences/Fireface USB Folder
/Users/username/Library/Preferences/de.rme-audio.FirefaceUSBMixer.plist
/Users/username/Library/Preferences/de.rme-audio.TotalmixFX.plist
/Users/username/Library/Preferences/de.rme-audio.Fireface_USB_Settings.plist
/Library/LaunchAgents/de.rme-audio.firefaceUSBAgent.plist
   
   
FireWire
/Applications/Fireface Mixer
/Applications/Fireface Settings
/System/Library/Extensions/FirefaceAudioDriver.kext
/Users/username/Library/Preferences/Fireface Folder
/Users/username/Library/Preferences/com.rme.FirefaceMixer.plist
/Users/username/Library/Preferences/de.rme-audio.TotalmixFX.plist
/Users/username/Library/Preferences/de.rme-audio.FirefaceSettings.plist
/Library/LaunchAgents/de.rme-audio.firefaceAgent.plist

Under the latest Mac OS the User/Libraries folders are hidden and not visible in the Finder. To unhide them start terminal and enter:

"chflags nohidden ~/Library/"

Update 2013: Under the latest Mac OS the User/Library folder is not visible in the Finder. To unhide it start Finder, click on the menu item Go. Hold down the option (alt) key, then click on Library.