The Primary Term modules allows you to specify which taxonomy term should be the "primary" term for a node. For nodes that can have multiple terms from a single vocabulary, a primary term can specify which summary page the node should be listed on, which theme template to apply, etc.
Recent Development
After being more or less unmaintained for 2 years, I've fixed a bunch of bugs and added new features and integrated with a bunch of core modules, based on code people have submitted in the issue queue since the last time it was actively maintained. New features in 6.x-1.2 include:
Note: As of 2011/06/02, this module appears to no longer be supported. If you are interested in taking this module over, or you as the module maintainer feel this message has been posted in error, please reply to #992652: Portal module appears to be abandoned.
Allows the creation of special Resource Pages that aggregate content both locally and from several 3rd party services and presents the content in an attractive format.
This module creates several user lists, which may be viewed as pages and blocks. User lists may be displayed alphabetically, beginning with A-Z, by newest, by role, or as a list of users who have posted content of a certain type.
Note: I have created a new module, http://drupal.org/project/views_gallery, that will replace this module for D6. It uses a different method where each gallery is a node so that you can use the normal Organic Groups access control instead of using Taxonomy. Getting access control working across both Organic Groups and Taxonomy is a major project that has been very buggy.
Note: As of 2011/06/02, this module appears to no longer be supported. If you are interested in taking this module over, or you as the module maintainer feel this message has been posted in error, please reply to #228727: Backup module appears abandoned.