This module which is part of the Devel module in Drupal 6, makes theming a great deal easier. It makes it quick to find out what selector in what stylesheet, or what .tpl file, or what function, is controlling the output - so that you can make changes directly.

Enable the block, and you will see a grey box, 'Themer Info', in the bottom left of your screen. Click on it to enable the Theme Developer tool which allows you to click on any element on your page and see information about what is outputting it.

If a whole group (fieldset) is marked to be hidden by CCK Field Permissions, the group is not hidden. To get it to work you either have to patch, or change the weight of the cck_field_perms module to 10 or more in the [system] table. See http://drupal.org/node/169351 for explanations

The Image Caption module may be useful to us: http://drupal.org/project/image_caption

Excellent tutorial showing how to use the Thickbox module to pop up images in your gallery.

http://www.theartlab.net/files/drupalschool009.m4v 

Screencast: http://geoffhankerson.com/drupal/cck-nodereference-screencast.html

Notify module is a powerful way to subscribe users to periodic emails which include all new or revised content and/or comments much like the daily news letters sent by some websites. Even if this feature is not configured for normal site users, it can be a useful feature for an administrator of a site to monitor new content submissions and comment posts.

http://mydrupal.com/auto_subscribe_users_to_new_content_new_comments_to_...

Interesting module that by useful for us: it limits which content types may be created in organic groups.

http://drupal.org/project/og_content_type_admin 

Useful webcast:

http://geoffhankerson.com/drupal/cck-nodereference-screencast.html 

Here is a great module for search engine optimization.

http://drupal.org/project/seo_checklist 

 ... the module's config checklist as follows: 

 

Here is a module which helps users navigate the node archives.

 http://drupal.org/project/archive

 Primary visual aid is a calendar block.