Today, five years ago, Drupal 1.0.0 was released! The following snippet is taken directly from the original announcement:
Today, drop.org announces the release of drupal 1.00 after an extensive period of testing. Drupal is a full-featured content management/discussion engine using Apache/PHP/MySQL and suitable to setup a news-driven community or portal site similar to kuro5hin.org and slashdot.org. Current features include discussion forums, web-based administration, theme support, an open submission queue, content management, a modularized design, PHP sessions, user management with access control and username/profanity/hostname filters, error logging, a public diary module, an affiliate site module, backend/headline generation (RSS/RDF) and much more.
Full Announcement .