For anyone interested in seeing a Drupal site that pushes all the known limits of what Drupal can do, check out MTV-UK's newly relaunched site.
From the Lullabot press release:

Our users now have the ability to create and upload content to mtvflux.co.uk that will also be showcased on the broadcast channel. Drupal’s social networking capabilities make it a good match for our local development team’s needs and the software’s extensibility has allowed the creation of modules to interact with our on-air systems as well as SMS mobile and Flash-based interactive systems.

The site is built on Drupal 4.7 (with several improvements contributed for Drupal 5.0) and utilizes over 40 contributed modules, including the Content Construction Kit, Image, Buddylist, PrivateMsg, Views, VotingAPI, Webform and others. In addition, several additional modules were developed by the Lullabot team just for MTV.

This story can be Dugg here.

Drupal version: Drupal 4.7.x