Add talks by year to my wordpress blog.

category.php

<?php
/**
 * The template for displaying Category Archive pages.
 *
 * @package WordPress
 * @subpackage Twenty_Eleven
 * @since Twenty Eleven 1.0
 */

get_header(); ?>


                <style type="text/css">
                        #recent-posts li { list-style: none; margin-left: 15px; }
                        #recent-posts li.year { list-style: none; margin-left: 0px; font-size:1.4em; }
                </style>

  	<section id="primary">
			<div id="content" role="main">

			<?php if ( have_posts() ) : ?>

				<header class="page-header">
					<h1 class="page-title"><?php
						printf( __( 'Category Archives: %s', 'twentyeleven' ), '<span>' . single_cat_title( '', false ) . '</span>' );
					?></h1>

					<?php
						$category_description = category_description();
						if ( ! empty( $category_description ) )
							echo apply_filters( 'category_archive_meta', '<div class="category-archive-meta">' . $category_description . '</div>' );
					?>
				</header>

				<?php twentyeleven_content_nav( 'nav-above' ); ?>

			
		        <?php 

		          if (is_category('talks'))
		          {
		            echo "<ul id=\"recent-posts\">";

		             favrik_recent_posts('group=1&limit=500');
		            echo "</ul>";
		          } elseif (is_category('palestras')) {
		            echo "<ul id=\"recent-posts\">";

		             favrik_recent_posts('group=1&limit=500');
		            echo "</ul>";
		              
		          } else {
		            while ( have_posts() ) {
		              the_post();
		              get_template_part( 'content', get_post_format() );
		            }
		          }
		        ?> 

				<?php twentyeleven_content_nav( 'nav-below' ); ?>

			<?php else : ?>

				<article id="post-0" class="post no-results not-found">
					<header class="entry-header">
						<h1 class="entry-title"><?php _e( 'Nothing Found', 'twentyeleven' ); ?></h1>
					</header><!-- .entry-header -->

					<div class="entry-content">
						<p><?php _e( 'Apologies, but no results were found for the requested archive. Perhaps searching will help find a related post.', 'twentyeleven' ); ?></p>
						<?php get_search_form(); ?>
					</div><!-- .entry-content -->
				</article><!-- #post-0 -->

			<?php endif; ?>

			</div><!-- #content -->
		</section><!-- #primary -->

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

functions.php

// ...


/**
 Most important configuration variable is $group:
 0      -       Just put the date at the left side.
 1      -       Group by year, month, and day.
*/
function favrik_recent_posts($args = '') {
    global $wp_locale, $wpdb;

    // params fun
    parse_str($args, $r);
    $defaults = array('group' => '1', 'limit' => '10', 'before' => '<li>', 'after' => '</li>', 'show_post_count' => false, 'show_post_date' => true, 'date' => 'F jS, Y', 'order_by' => 'post_date DESC');
    $r = array_merge($defaults, $r);
    extract($r);
    
    // output 
    $output    = '';
    $pre       = '';
    $full_date = '';
    $year      = '';
    $month     = '';
    $day       = '';
    


    // the query
    $where = apply_filters('getarchives_where', "WHERE post_type = 'post' AND post_status = 'publish' AND tt.taxonomy = 'category' AND tt.term_id IN (82,85)");
    $join  = apply_filters('getarchives_join', " INNER JOIN {$wpdb->term_relationships} tr ON ($wpdb->posts.ID = tr.object_id) INNER JOIN {$wpdb->term_taxonomy} tt ON (tr.term_taxonomy_id = tt.term_taxonomy_id)");
    $qry   = "SELECT ID, post_date, post_title, post_name 
              FROM $wpdb->posts $join 
              $where ORDER BY $order_by LIMIT $limit";
    $arcresults = $wpdb->get_results($qry);
    if ($arcresults) {
        foreach ($arcresults as $arcresult) {
            if ($arcresult->post_date != '0000-00-00 00:00:00') {
                $url  = get_permalink($arcresult);
                if ($group == 0) { // dates at the side of the post link
                    $arc_date = date($date, strtotime($arcresult->post_date));
                    $full_date = '<em class="date">' . $arc_date . '</em> ';
                }
                if ($group == 1) { // grouping by year then month-day
                    $y = date('Y', strtotime($arcresult->post_date));
                    if ($year != $y)  {
                        $year = $y;
                        $pre = '<li class="year">' . $year . '</li>';
                    }
                }
                $full_date = date('d/m', strtotime($arcresult->post_date)).'&nbsp;';
                $text = strip_tags(apply_filters('the_title', $arcresult->post_title));
                $output .= get_archives_link($url, $text, $format, 
                                              $pre . $before . $full_date, 
                                             $after);
                $pre = ''; $full_date = '';
            }
        }
    }
    echo $output;
}