How to make block with list of terms from blog postings
It sounds as if you have created a view of nodes, and using the Taxonomy: All terms field to display the terms of those nodes. That approach will indeed produce duplicate results.

Instead, you need to create a view of Taxonomy Terms. I don't know which versions you are using, but here is the export of such a View made with Drupal 7  &amp; Views 7.x-3.0-rc1.

$view = new view;
$view-&gt;name = 'tags';
$view-&gt;description = '';
$view-&gt;tag = '';
$view-&gt;base_table = 'taxonomy_term_data';
$view-&gt;human_name = 'Tags';
$view-&gt;core = 7;
$view-&gt;api_version = '3.0-alpha1';
$view-&gt;disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Master */
$handler = $view-&gt;new_display('default', 'Master', 'default');
$handler-&gt;display-&gt;display_options['title'] = 'Tags';
$handler-&gt;display-&gt;display_options['access']['type'] = 'perm';
$handler-&gt;display-&gt;display_options['cache']['type'] = 'none';
$handler-&gt;display-&gt;display_options['query']['type'] = 'views_query';
$handler-&gt;display-&gt;display_options['query']['options']['query_comment'] = FALSE;
$handler-&gt;display-&gt;display_options['exposed_form']['type'] = 'basic';
$handler-&gt;display-&gt;display_options['pager']['type'] = 'full';
$handler-&gt;display-&gt;display_options['pager']['options']['items_per_page'] = '10';
$handler-&gt;display-&gt;display_options['style_plugin'] = 'default';
$handler-&gt;display-&gt;display_options['row_plugin'] = 'fields';
/* Field: Taxonomy term: Name */
$handler-&gt;display-&gt;display_options['fields']['name']['id'] = 'name';
$handler-&gt;display-&gt;display_options['fields']['name']['table'] = 'taxonomy_term_data';
$handler-&gt;display-&gt;display_options['fields']['name']['field'] = 'name';
$handler-&gt;display-&gt;display_options['fields']['name']['label'] = '';
$handler-&gt;display-&gt;display_options['fields']['name']['alter']['alter_text'] = 0;
$handler-&gt;display-&gt;display_options['fields']['name']['alter']['make_link'] = 0;
$handler-&gt;display-&gt;display_options['fields']['name']['alter']['absolute'] = 0;
$handler-&gt;display-&gt;display_options['fields']['name']['alter']['word_boundary'] = 0;
$handler-&gt;display-&gt;display_options['fields']['name']['alter']['ellipsis'] = 0;
$handler-&gt;display-&gt;display_options['fields']['name']['alter']['strip_tags'] = 0;
$handler-&gt;display-&gt;display_options['fields']['name']['alter']['trim'] = 0;
$handler-&gt;display-&gt;display_options['fields']['name']['alter']['html'] = 0;
$handler-&gt;display-&gt;display_options['fields']['name']['hide_empty'] = 0;
$handler-&gt;display-&gt;display_options['fields']['name']['empty_zero'] = 0;
$handler-&gt;display-&gt;display_options['fields']['name']['link_to_taxonomy'] = 1;
/* Sort criterion: Taxonomy term: Name */
$handler-&gt;display-&gt;display_options['sorts']['name']['id'] = 'name';
$handler-&gt;display-&gt;display_options['sorts']['name']['table'] = 'taxonomy_term_data';
$handler-&gt;display-&gt;display_options['sorts']['name']['field'] = 'name';
/* Filter criterion: Taxonomy vocabulary: Machine name */
$handler-&gt;display-&gt;display_options['filters']['machine_name']['id'] = 'machine_name';
$handler-&gt;display-&gt;display_options['filters']['machine_name']['table'] = 'taxonomy_vocabulary';
$handler-&gt;display-&gt;display_options['filters']['machine_name']['field'] = 'machine_name';
$handler-&gt;display-&gt;display_options['filters']['machine_name']['value'] = array(
  'tags' =&gt; 'tags',
);

/* Display: Page */
$handler = $view-&gt;new_display('page', 'Page', 'page');
$handler-&gt;display-&gt;display_options['path'] = 'tags';