Menu Extra Enabler is a utility that will enable third-party menu extras on Mac OS X 10.2 Jaguar, Mac OS X 10.3 Panther, Mac OS X 10.4 Tiger, and Mac OS X 10.5 Leopard.
This haxie allows you to use all of them again on Jaguar, Panther, and Tiger.
Requirements : PPC / Intel, Mac OS X 10.2 or later.