Helium is another article warehouse of sorts. The way it works is, there are hundreds of article titles on the site, and you write an article that falls under one of those titles (you can also suggest your own, but you don't earn the page view bonus unless there are more than three articles in the title). You and other writers at Helium rate the articles, so the best ones rise to the top. You earn a few pennies for page views, and every once in a while someone will come along and buy your article. There are also contests you can participate in for cash prizes and debates that help to stimulate your creativity.
The best part of Helium is the Marketplace. Publishers contract with Helium to purchase articles written by Helium authors. The publisher posts the articles they want, along with guidelines and the price. Helium writers write the articles and rate them, and the publisher reads the top few and chooses one. Those that aren't chosen are transitioned to the Helium website to earn pennies. The great part about this is that the article prices range from $16 to $200 (that I've seen). The drawback is that you might be writing the article for nothing. I've done a couple that really didn't translate well to the regular site, so they were a waste of time. I haven't sold any there yet, although I have four submitted to a new online horse magazine, so I hope at least one sells!