One of my favourite magazine Business2.0 ( it had 2.0 many years before the current 2.0 craze ) has a cover story on Blogging for dollars, very interesting on the rising importance of blogging and the earning potential it offers to good bloggers.
Some excerpts.
Blogs today benefit from what might be termed uneconomies of scale: They are so cheap to create and operate that a lone blogger or a small team can, with the ever-expanding reach of the Internet, amass vast audiences and generate levels of profit on a per-employee basis that traditional media companies can only fantasize about.