Is it possible to make money blogging?

[Jake]

Writing about what you have a passion or strong internet in gives you a better chance of remaining motivated enough to develop a significant publication, most commonly people start with Google AdSense which places ads that best match the content of each page, writing about what people spend money on helps you earn more. Some sites require 10,000 visitors to earn the $100 min payout.

Here's a list of serious bloggers who were reporting their revenue sources and earnings a few years ago, spurred on I believe by a challenge from John Chow:
http://workhomebusiness.org/blogs-reporting-income/