Demand Studios offers several types of positions from home - writers, movie makers, copy editors, etc. I will focus on writing here as this is what I have experience with. Their set up is very professional - you apply, and if accepted you can create a bio, fill in your tax info and begin claiming articles. There are a wealth of topics to write about, so you will never get bored. Payment varies from fixed rates to revenue sharing.
Check them out at www.demandstudios.com