There are a lot of ways to make money online. 8 Ways to Make Money Online continues to be one of the most popular posts here on BWA.
But I came across this older post from ProBlogger recently, 13 Ways for Bloggers to Make Money with Advertising, and it's very worth passing on.
I especially love the mind map he created which outlines a whole host of monetization ideas. If you're stumped about what you can do to generate income online, he covers most of them here. It's a great brainstorming resource!
(Click on the image to be taken to the post and get an explanation of each.)
When you're done there, check out all my posts about making money online.