Helium is one of many websites that you can get paid to write on a variety of topics. Some of the topics will pay you up-front and some of them you get paid based on a variety of factors including page views and how well your article gets rated. If you are knowledgeable about a certain area and a decent writer give it a try. i decided to give it a try and see if it is worth it. Here are two articles I posted today on Making Money Online and another on Paid Product Testing. Both of these articles would probably be of interest to those of you trying to make money online.
Other websites that will pay you to write online are listed below. Some of them you have to apply to write about a certain topic and others you just sign up and start writing like with Helium.