For the heck of it, I did a search for that. And lookie what I found:

Why blog?

My blog:

• is a place where I think, plan and reflect
• forces me to read in order to gather the input I need for my output
• is a place where I play with technology and ideas
• often surprises me
• is a place where I collaborate
• is currently the most satisfying part of my job
• is slightly dangerous
• is compulsive

Why blog for business?

From a business perspective there are several potential reasons to blog. But, as always, it depends on what you want. Blogs are no different from channels like video, print, audio, presentations and so on. They all deliver results - but of varying kind. The kind you can expect from blogs is mainly about stronger relations with important target groups.

• Become the Expert
• Customer Relationships
• Media Relations
• Internal Collaboration
• Knowledge Management
• Recruitment
• Test ideas or products
• Rank high in Search Engines

Why I Blog - The Atlantic (November, 2008)

For centuries, writers have experimented with forms that evoke the imperfection of thought, the inconstancy of human affairs, and the chastening passage of time. But as blogging evolves as a literary form, it is generating a new and quintessentially postmodern idiom that’s enabling writers to express themselves in ways that have never been seen or understood before. Its truths are provisional, and its ethos collective and messy. Yet the interaction it enables between writer and reader is unprecedented, visceral, and sometimes brutal. And make no mistake: it heralds a golden era for journalism.

But this one really caught my attention:

Why Blog? Reason No. 92: Book Deal (NYT)-March, 2008

That one is particularly interesting because it shows how blogs are busting through some of the difficulties writers have faced regarding getting published. The story is about a funny blog that garnered enormous popularity and in the process, a book deal.

All in all, there are a lot of reasons to blog - it all depends on what motivates you.

I've found it to be an outlet for what's happening in the War in Iraq; how things are touching my family; politics; elections; religion; my personal faith; discussion on music; culture; books; just about everything under the sun.

Why do YOU blog?