The key features of wordpress are -

1. Full standards compliance

2. No rebuilding

3. WordPress Pages

4. WordPress Links

5. WordPress Themes

6. Cross-blog communication tools

7. Comments

8. Spam protection

9. Full user registration

10. Password Protected Posts

11. Easy installation and upgrades

12. Easy Importing

13. XML-RPC interface

14. Workflow

15. Typographical niceties

16. Intelligent text formatting

17. Multiple authors

18. Bookmarklets

19. Ping away