How can I get a brightness controller in my Gnome-Classic panel?

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http://askubuntu.com – I've searched through various packages and applications in Synaptic, but I can't find any panel applets that will let me control screen brightness settings. Does such a panel applet exist? Is it part of some larger package? I'm looking for something that will give me close to one-click access to brightness settings. (HowTos)