Wealth of features on the fly

Just to give you a taste of the spicy Drupal:

Flexible, reliable and extendable functionality

Human friendly membership system, handling from 1 to 100,000 users and more

User profiles, extensible according to your requirements

Search Engine Friendly, allowing for top rankings by Google, Yahoo and MSN

Sensible Categorization system allowing you to create classifications of content

Many types of content - not just text, but also handling audio, video, PDF, HTML, PHP, Java

Reliable search function, human friendly and readable URLs - good for humans, good for Google

RSS Feed and Live Bookmarking for readers and users.

Easily read and indexed by Google, and able to be ranked in top search result pages, fast and definitive link from Google

Statistics and referrers - to see how people find your websites,
what keywords, names, what ranking by Google, Yahoo and many search
engines, who put links to your website

Contact form, and what a surprise - working properly! Receive feedback and inquiries with no mailto:webmaster@yourdomain.com which gets spammed

User activities and logs - can see what users look for (search), who registers and logins, time and date, content management