I was reading over at the Suite 101 forums that World.edu is looking for a few good writers. This freelancing site needs people who write on sustainability, innovation, social change and green technology. Many of the articles are in the how-to or top 10 list format.They pay with 60% of the ad revenue share and bonuses for popular pieces. The site doesn't say what rights they want, so be careful if you choose to give them a try. For more information see their Write for Us Page.