For Christmas, I received two books: ProBlogger: Secrets for Blogging Your Way to a Six-Figure Income by Darren Rowse and Moonlighting on the Internet by Dan Kennedy. Both are excellent!
Each one attacks it from a different direction but generally cover how to decide on a niche, strategies for making money, and how to promote your blog. Moonlighting also covers making money from eBay, eCommerce stores, and affiliate links.
If you're looking for a way to make a little money while on the Internet, I highly recommend these two books.