How to Make Money Blogging

Lots of people blog these days. It is a natural extension of social networking sites. People even do "micro blogging" by posting updated information on Twitter. Granted it is not more than a sentence or two but it still keeps people informed. And that is what a blog is for, or rather, what it is intended for.

So what do you blog about?
Do you blog about your personal life?
Do you blog about how work is weighing you down and you want to make a go of it on your own?