design for style
Recommended Drupal modules
This is a list of some of our favorite Drupal modules. It will be updated from time to time.
Pathauto - automatic creation of path aliases based on your settings.
http://drupal.org/project/pathauto
Token
http://drupal.org/project/token
BUEditor - add markup to posts via buttons (and you can add your own!)
http://drupal.org/project/bueditor
Imagefield + imagecache
http://drupal.org/project/imagefield
http://drupal.org/project/imagecache
Views - query builder
http://drupal.org/project/views
CCK - content construction kit
http://drupal.org/project/cck
CCK's Node reference and User reference
(especially in combination with views)
(... not sure about handling reciprocal references...)
Global redirect - resolves the trailing slash issue for better SEO
http://drupal.org/project/globalredirect
Path redirect - adds options for redirects for better SEO
http://drupal.org/project/path_redirect
Related links - implements some heuristics to find content related to current node
http://drupal.org/project/relatedlinks
Panels 2 - advanced layouts and content display, and contextual powers
http://drupal.org/project/panels
Nodequeue - manage and order a special list of content (with tweaky control in a way Views doesn't let you)
http://drupal.org/project/nodequeue
Workflow_ng - configure advanced workflows based on events in Drupal
http://drupal.org/project/workflow_ng
Views bookmark - let users bookmark pages in a site
http://drupal.org/project/views_bookmark
Content access - the most sane solution to the access control that I've found
http://drupal.org/project/content_access
CAPTCHA and ReCAPTCHA - spam prevention
http://drupal.org/project/captcha
http://drupal.org/project/recaptcha
Coder - code review for modules and module upgrade help
http://drupal.org/project/coder
Haven't tried, but want to keep on the radar:
Search attachments - index the contents of .docs, .pdfs, and .txt files
http://drupal.org/project/search_attachments
Teleport - productivity enhancement that lets you jump to pages in a site using a Quicksilver-like interface
http://drupal.org/project/teleport
Modules I maintain
Insert View - embed views into nodes and blocks without using PHP
http://drupal.org/project/insert_view
Insert Block - insert blocks into nodes without using PHP
http://drupal.org/project/insert_block

Appreciate the recomendations
Yes, it does seem like there are a lot of Drupal modules out there. Couple tips before downloading a module that might save you some headaches - first take a look at the issue queue for the module and:
a) make sure that people seem generally happy
b) how active the developer(s) are (do they respond to issues)
c) if there are any worthwhile pathes posted
d) if anyone in the threads has posted a recommendation for a module that does the job better
Thanks for your comments, and it was good to speak with you and your team - very exciting project, indeed!
Also, this is a fun link - the list where newly posted modules show up.