Reset menu bar on Leopard Mac OS X
Items in bold are command line entries.
I added CPU.menu from /System/Library/CoreServices/Menu Extras and wanted to get rid of it and no way to do it. After CPU.menu started iStat menus would not start anymore and the way to get menu bar back to normal is to run the commands below. After I ran the commands below I was able to start iStat again
Reset menu bar to only have Airport, Volume, Battery and Clock
defaults write com.apple.systemuiserver menuExtras\
'( "/System/Library/CoreServices/Menu Extras/AirPort.menu",
"/System/Library/CoreServices/Menu Extras/Volume.menu",
"/System/Library/CoreServices/Menu Extras/Battery.menu",
"/System/Library/CoreServices/Menu Extras/Clock.menu")'
Restart UI Server
killall -HUP SystemUIServer
If SystemUIServer is not running, open terminal and run /System/Library/CoreServices/SystemUIServer.app