Type of Features you can have on your website:

1. Event listings
2. Polls
3. Surveys
4. Calendars
5. Newsfeeds
6. Login Area for members
7. Guest Book
8. Photos
9. Videos
10. Live Support
11. Help Desk
12. Chat / IM
13. Project Management
14. Newsletter
15. Distribution lists
    
16. many many more options