add_action( 'init', 'fb_remove_admin_bar', 0 );
function fb_remove_admin_bar() {
	wp_deregister_script( 'admin-bar' );
	wp_deregister_style( 'admin-bar' );
	remove_action( 'init', '_wp_admin_bar_init' );
	remove_action( 'wp_footer', 'wp_admin_bar_render', 1000 );
	remove_action( 'admin_footer', 'wp_admin_bar_render', 1000 );
	// maybe also: 'wp_head'
	foreach ( array( 'admin_head' ) as $hook ) {
		add_action(
			$hook,
			create_function(
				'',
				"echo '<style>body.admin-bar #wpcontent, body.admin-bar
#adminmenu { padding-top: 0px !important; }</style>';"
			)
		);
	}
}