I have tried to install only modules that I needed to meet the immediate designs I was trying to achieve. In my travels, though, I thought these modules looked very interesting and worth checking out:
- Hovertips and Clicktips | drupal.org - uses JQuery (AJAX) to create nice pop-up or roll-down tips. Really useful for displaying complex information or hiding stuff that's not used much (e.g., hide all comments current user has already seen.
- Panels | drupal.org - provides API and UI for creating sophisticated panelled layouts. With related "mini-panel" modules to add AJAX tabbed panels and carousel panels Mini Panels demo | Wim Leers
- Node Queue | drupal.org - allows you to display items from a "queue" that automatically drops last item when a new one is added. Can be used manually for creating "top 5" type lists, or integrated with actions module to automate.
- module_builder - I install this locally to make custom module development easier. It simple creates a template for a new module based on a few settings. Only useful for developing a new custom module from scratch.
- form_inspect - a companion for the devel module, this is useful if you are working with forms (say implementing a hook_form_alter), and want an easy way to see view the form data structure.
- chipin - for collecting money for a cause ** NOT AVAILABLE in 5.0 YET **
- nodewords - meta tag (description, keywords) for each page.
- rsvp - enables rsvp for events (probably won't work with the CCK event types I defined :-( Perhaps re-develop for CCK date field?)
- volunteer_timeslots - for organising events where volunteers sign up for a timeslot - ditto!
- spam - spam blocking tools.
- taxonomy_access - access control for users based on taxonomy categories.
-taxonomy_role - access control to taxonomy field on node-edit forms. Useful to allow admin to place "hidden" taxonomy term in a node, probably for organisational purposes.
- cck_role - same thing for a CCK field. Could be handy.
- Notifications - a potential replacement / upgrade for Notify and/or Subscriptions?
- Custom Breadcrumb - format breadcrumbs for custom views.