Basically this is a good and useful idea, I use it a.) because I am using a keyboard without volume key and b.) my monitor is large enough that a trip to the menu bar is a nuisance. Having said that, there are some drawbacks: a.) I wish this were a preference pane rather than an an app., as then it wouldn't clutter the dock with yet another item (this would only be useful if the volume controls were in the dock icon itself), b.) it doesn't work quite right on Tiger: the preference panel always displays when you launch, and if you dismiss that panel you can no longer check the mute box. And as an alternative to this app, I'l prefer something that let me control volume/muting with some user-defined keystrokes rather than requiring me to visit a dialogue box.