1. You enjoy blogging.
2. You love to blog.
3. You want to blog.
4. Blogging is fun.
5. Blogging makes you feel good.

via webgazette

1- Fast Search Engine Spidering and Indexing of Your Site

2-blogs can Build Your Backlinks Quickly

3-A Frequently Updated blog will Keep the Spiders Visiting Your Site Often

4-Your Site is Stickier and More Appealing to Visitors

5-A blog Is The Fastest And Easiest Way To Build A Brand-New website Without Training

6-Keyword competition in RSS feed sites is much less than in the SE's

via en8848.com

1. To Express Your Thoughts and Opinions

2. To Market or Promote Something

3. To Help People

4. To Establish Yourself as an Expert

5. To Connect with People Like You

6. To Make a Difference

7. To Stay Active or Knowledgeable in a Field or Topic

8. To Stay Connected with Friends and Family

9. To Make Money

10. To Have Fun and Be Creative

via weblogs.about.com

10. Blogs are one of the least expensive methods of getting the word out on your company and creating buzz.

9. Search engines will find your blog, much faster than your website.

8.  Blogs create an organic, powerfully evolving user experience. 

7.  Blogs build a stronger and more vibrant knowledge base. 

6.  Prospects are searching the web via search engines for everything, including deals and opportunities. 

5.  You can develop yourself as the thought leader in your industry. 
                       

4. The winners will be those who host the very best conversations.

3.  Having a blog turns you into a producer and star of your own show. 

2.  Blog posts are on the web forever.  

1. If you aren’t out there, your competitors will be.

via businessbloggingconsultants