Three Column Category Sample

<?php
/**
 * Template Name: One Category 3 Column
 *
 * A custom page template Page Name = Category Name .
 *
 * The "Template Name:" bit above allows this to be selectable
 * from a dropdown menu on the edit page screen.
 *
 * @package WordPress
 * @subpackage Twenty_Ten
 * @since Twenty Ten 1.0
 */
get_header(); ?>

        <div id="container">
            <div id="content" role="main">
<?php if ( have_posts() ) while ( have_posts() ) : the_post(); ?>
                <div id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
                    <div class="entry-content">
                        <?php the_content(); ?>
                    </div><!-- .entry-content -->
                </div><!-- #post-## -->
<?php endwhile; ?>

            <?php
            /*
            Run the loop to output the posts.
            Store the page to use later
            */
            global $post;
            $tmp_post = $post;
            //Create a query for the category
            $pageslug = $post->post_name;
            $catslug = get_category_by_slug($pageslug);
            $catid = $catslug->term_id;
            //Get the total Count of posts
            $postotal=(int) get_category($catid)->category_count;
            $query= 'cat=' . $catid. ''; query_posts($query);
            //Round up to the Nearest Whole Number
            $postcount = ceil($postotal/3);
            ?>

            <?php if ( have_posts() ) : ?>
                <div class="cms-columns"><!-- Add Column Container -->
                    <div class="cms-column"> <!-- Add Column -->
                    <?php /* Start the Loop */ ?>
                    <?php while ( have_posts() ) : the_post(); ?>
                    <?php $counter+=1; ?>
                    <?php if( ($counter !=  $postotal) && !($counter % $postcount) ) : // Remainder = 0 ?>
                        </div> <!-- Close Open Column -->
                        <div class="cms-column"> <!-- Add Column -->
                    <?php endif; ?>
                        <!-- START DO YOUR POST STUFF HERE -->

                        <!-- END DO YOUR POST STUFF HERE -->
                    <?php endwhile; ?>
                    </div><!-- Close Open Column -->
                </div><!-- Close Column Container -->
            <?php endif; ?>

            <?php
            //Reset our page to get the sidebar
            $post = $tmp_post;
            ?>
            </div><!-- #content -->
        </div><!-- #container -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>