Wow, that's a really open-ended question. There's tons of ways to make money online.
-You can earn money just by writing on sites like Hubpages, Squidoo, Today.com.
- You can "sell" articles to a site like AssociatedContent.com and make a few bucks for every article.
- You can participate on a site like Mahalo.com and earn money by participating on the site and answering questions.
- You can start your own blog and slap some Adsense ads on it.
- You could sell your services as a copywriter and advertise yourself on a free forum like at DigitalPoint forums.
I'm sure there are plenty more, that's what I can think of off the top of my head.