admin - Getting Rid of the WordPress.com Toolbar on Other Sites? in WordPress

Add the following code to your user stylesheet:

#wpcombar
{ height: 2px !important; overflow: hidden !important;
}
#wpcombar:hover,
#wpcombar:focus
{ height: 28px !important;
}

This will shrink down the toolbar to a 2px line. You may use display:none to remove it completely, but then it willt be accessible when you need it.