Some of these can help you make your blog popular depending upon the NICHE of your Blog.

1. Firstly, Be Yourself...even if you dont follow any other points below is fine...THIS IS MUST.
2. Be Creative.... Be Innovative....... surely you can...
3. Start Loving it ....you will make it better and better.. day by day.. everyday.......
4. Re-Dress ur blog to give a fresh look. 
   
5. Interview other bloggers and post the interview.
6. Share / Write about your personal life sometimes.
7. Ask questions to your visitors.
8. Celebrate your/your blog’s birthday with your visitors in an innovative way..
   
9. Encourage sharing of opinions.
   
10. Put your blog’s ad in the local newspaper or the yellow pages.
    
11. Create polls.
    
12. Write about your blog achievements.
    
13. Share your hopes and aspirations about your blog.
    
14. Make contact with your local visitors and hold a get-together or a bloggers’ meet.
    
15. Start a blog comic strip.
16. Dig up some old article that you wrote on your blog which became famous and start a discussion.
17. Post videos that will help your visitors learn something new. Also submit them to video sharing websites like YouTube.com.
    
18. Write about your hobbies and interests. (For example, if you like cooking, post a new recipe)
19. Post about one of the weirdest thing that you ever did.
20. Brand your blog with a catch phrase along with a logo.
    
21. Join Yahoo! Answers and put a link on your website to your answers.
    
22. Do surveys and publish the results to your visitors.
    
23. Build tools that your visitors might find use for.
24. Start a newsletter.
25. Podcasting is another good way to make your blog popular.
26. Publicize your blog to your friends and relatives and let them do some work for you.
27. Be active in Social Bookmarking websites.
28. Share Link Love and you will get it back.
29. People like to read about NEW, TECH, SOLUTION, SELF....., Write about it.
30. Write about something that’s already famous.