defaults write com.growl.growltunes GrowlTunesWithoutMenu 1Relaunch GrowlTunes, and the menu bar icon is no longer displayed. Note that after making this change, you no longer have access to the GrowlTunes menu bar functions. You can still quit the app by opening Activity Monitor, selecting GrowlTunes, and clicking Quit Process.
To reverse this change, type the same command, but with a 0 at the end, instead of a 1.

