We have recently put up our Drupal 5 site which was a consolidation of Joomla and Plone based sites from other areas of our organization that was consolidated onto a unified site on Drupal.
We needed a CMS that could easily acamodate a large number of languages, content and forums. We have a number of other languages being completed along with thousands of pages of multi-lingual content that is being moved from our Joomla and Plone sites.
In not very much time at all, I've whipped together a new Drupal site which uses the Google Custom Search Engine module along with a CCK custom type and views to create a topical, user contributed search site.
londongt.org has been making a lot of Drupal sites over the past year now, but studentnet is the most complex that we've had to make. Studenet is a network for pupils in the UK using some of the normal drupal features such as discussion boards and polls along with video and photo content via Flickr and youTube (see the Create & Share and Tech tips pages for an example of this in action).
Most of the pages use the views module to pull in multiple nodes.
We used the feedparser module for the news aggregation on the buzz pages, using tags to define the different news types and Taxonomy images to displays the feed sources logo. A similar situation was done for pulling in the flickr images and you tube videos and using a slightly modified version of this Javascript for the 'Play video' buttons which you can see in action on the Tech tips page.
Take a look on my website created for the Wroclaw city (Poland): http://seniorzy.izp.wroclaw.pl.
We try to put there some information concerning old people living in our city. Unfortunately, content is only in Polish, but you can evaluate the design at least :)