MichaelH

Not sure this answers exactly, but from a previous example:

<?php
// get 20 latest posts, display the categories used on those posts (most recent categories)
$cat_array = array();
$args=array(
  'post_type' => 'post',
  'post_status' => 'publish',
  'posts_per_page' => 20,
  'caller_get_posts'=> 1
  );
$my_query = null;
$my_query = new WP_Query($args);
if( $my_query->have_posts() ) {
  while ($my_query->have_posts()) : $my_query->the_post();
    $cat_args=array('orderby' => 'none');
    $cats = wp_get_post_terms( $post->ID , 'category', $cat_args);
    foreach($cats as $cat) {
      $cat_array[$cat->term_id] = $cat->term_id;
    }
  endwhile;
}
if ($cat_array) {
  echo '<p>List of categories used on 20 latest posts</p>';
  foreach($cat_array as $cat) {
    $category = get_term_by('ID',$cat, 'category');
    echo '<p><a href="' . esc_attr(get_term_link($category, 'category')) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a><p> ';
  }
}
wp_reset_query();  // Restore global post data stomped by the_post().
?>

<?php $my_query = new WP_Query('showposts='.$section1_numberofposts.'&cat='.$section1_categoryid); ?>

Well if post.php is the template that displays your posts then that would work.

Could use this http://wordpress.org/extend/plugins/simplr-registration-form/

If you want WordPress to place the registration automatically in each post you would add code to the appropriate template (e.g. your theme’s index.php maybe):

<?php echo do_shortcode('[Register]'); ?>

Also see:
Stepping Into Templates
Template Hierarchy

You can do it pretty quickly without a plugin.

Under Posts->Categories, under Screen Options set the number of categories to 999 then use the Select and Bulk Delete to delete 999 categories at one time.

Look at:
http://wordpress.org/extend/plugins/wp-custom-fields-search/

You’ll also want to review
Stepping Into Templates
Template Hierarchy

Can’t say how the plugin does it…didn’t test this, but might try this in your loop:

<?php
$taxonomy = 'post_tag';
$args='';
  $terms = wp_get_post_terms($post->ID , $taxonomy, $args);
  if ($terms) {
    foreach ( $terms as $term ) {
      if ($term->count > 1) {
        echo '<p><a href="' . esc_attr(get_term_link($term, $taxonomy)) . '" title="' . sprintf( __( "View all posts in %s" ), $term->name ) . '" ' . '>' . $term->name.'</a> has ' . $term->count . ' post(s). </p> ';
      }
    }
  }
?>