3 column twenty eleven http://zeaks.org

*/ ADD TO FUNCTIONS.PHP */

// Register out extra sidebar for the three column layouts
        register_sidebar( array(
                'name' => __( 'Extra Sidebar', 'twentyeleven' ),
                'id' => 'extra-sidebar',
                'description' => __( 'The sidebar for three column layouts', 'twentyeleven' ),
                'before_widget' => '<aside id="%1$s" class="widget %2$s">',
                'after_widget' => "</aside>",
                'before_title' => '<h3 class="widget-title">',
                'after_title' => '</h3>',
        ) );

/* ADD TO SIDEBAR.PHP AFTER #SECONDARY DIV */

        <!-- Add our .extra-sidebar are for three column layouts -->
<div id="extra-sidebar" class="widget-area" role="complementary">
    <?php if ( ! dynamic_sidebar( 'extra-sidebar' ) ) : ?>
    <?php endif; // end extra sidebar widget area ?>
</div><!-- .extra-sidebar .widget-area -->


/* CSS for 3 column Layout
------------------------------------------------ */
#page { max-width: 989px;}
#primary {
    float: left;
    margin: 0 -26.4% 0 0;
    width: 100%;
}
#content {
    margin: 0 34% 0 26.4%;
    width: 46.4%;
}
#secondary {
    float: right;
    margin-right: 2.6%;
    width: 19.8%;
}
#extra-sidebar{
        position:relative;
    float: left;
    width: 19.8%;
    margin-left: -70%;
}
/* Adjust the comments */
.commentlist, #respond {
    margin-right: -2%;
}
/* Extra sidebar fix for narrow browsers/media devices */
@media (max-width: 800px) {
#main #extra-sidebar{
                float: none;
                margin: 0 7.6%;
                width: auto;
        }
}