Information on Drupal
Website Management System - Build Something Amazing
is a free, open-source web development platform for online content and user communities. Drupal powers some of the busiest sites on the web, and can be adapted to virtually any visual design. Drupal runs over a million sites, including WhiteHouse.gov, World Economic Forum, Stanford University, and Examiner.com.
Drupal is radically changing on-line spaces. Is your space one of them?
When you ask whether you should use Drupal OR write everything from scratch, I'd definitely go for Drupal.
What makes Drupal shine for me is its versatility in defining "atomic" elements of any website: user profiles ("registered", "entitled-to-edit-agenda-items", "can-only-read-stuff-older-than-a-week", etc. etc.), content types ("agenda-item", "address-card", "big-article", etc.), and above all: its taxonomy, i.e. an extremely flexible system to organize any "semantic content" you want to throw in your site. Having these "atomic building blocks" at your disposal, Really feels like a biiiiig relief. It's simply Fun to play around with them.
Sure, you can program all this yourself. But you'd be in for many, many months, and then still you'd probably have only a fairly shaky thing. Drupal deals with about 100 database tables, one hundred. Just getting those to work nicely and reliably together would give you many months of headache.
The confidence in the power of Drupal as an enterprise-class application framework by many fortune 500 companies confirms that the flexibility of Drupal as a platform
combined with solid design and development resources, creates the possibility for rich user experiences and large-scale web solutions. This is solid proof that these companies can combine the robust flexibility of the Drupal platform, with the world class skills of dedicated designers and developers from the Drupal community, to build rich content work flows and social networking features into a powerful web tool sets to serve and support massive customer bases globally while eliminating licensing and residual costs from competing proprietary solutions.