For those who don't know, this web site runs CivicSpace, an open source content management system (CMS) based on Drupal.

This is some seriously cool stuff - a web site for the Ann Arbor public library built on Drupal:

http://www.blyberg.net/2005/12/04/lessons-learned-aadlorg-30/

These are also interesting but more specific:
http://www.blyberg.net/2005/12/01/aadl-rss-feeds-extended-to-all-catalog-searches/
http://www.blyberg.net/2005/12/08/iii-bib-to-asin-to-cover-art/

I think that's just about the most unique Drupal implementation I've seen yet, especially with those custom features. That first article makes a good argument for why one should use Drupal (and by extension CS) over other platforms.