Some of the core features include:

• Dynamic Web 2.0 layout
• Multi site support
• Multilanguage support
• Multiple Menu Block for unlimited menu items
• WYSIWYG Content management system with attachments, pictures and comments system
• Dynamic HTML Forms
• Extensibility using Modules
• Content Codes
• RSS Feeds
• Advertisement support
• Member management
• SEO Friendly links
• Security system with Brute Force and Password Trading Protection
• Custom 404 Error and Maintenance Pages
• API - Partial Classes

For further extensibility there is the Modules system with some of them already implemented like:

• 
  Photo Gallery
• File Sharing
• Contact
• Local Search engine
• Shopping
• Video Gallery
• Polls (voting)