><?php
$vid = 1;  // Set the vid to the vocabulary id of the vocabulary you wish to list the terms from
$items = array();
 
$terms = taxonomy_get_tree($vid);
foreach ( $terms as $term ) {
  $count = db_result(db_query("SELECT COUNT(nid) FROM {term_node} WHERE tid = %d", $term->tid));
  $items[] = l($term->name, "taxonomy/term/$term->tid") . " ($count)";
}
 
if ( count($items) ) {
  print theme('item_list', $items);
}
?></blockcode>