This is a useful thread. I am trying to set up streams of income that don't require a lot of input from me, and are recurring. Article marketing seems to fit my needs and skills. I saw that Black Hat World has a whole section dedicated to article marketing. It's a lot less lucrative than $100 a day after two weeks, but has potential.Go to associatedcontent.com, write like 20-40 articles a day, after about 2 weeks you'll start earning like 100/day.
You could always take the easy way out and find one of those huge PLR packs, download a cracked copy of Dragon Naturally Speaking and do your own re-write of articles by talking into a mic.
Some times they do contests and you can earn anywhere from $10-$30 for one article
There is a 2 week wait for acceptance, and they pay as little as $2 per article. They don't accept everything you send them, so I doubt they would accept 20-40 a day.
I think that constant submissions will slowly increase income to $50 a day, but this could reasonably take months of constant submissions. A couple of very motivated people have several accounts at different sites, enhancing the process, and they're doing very well.
I like the idea of article submissions because it's like a bank account of sorts: instead of depositing money, you deposit your work, and it draws interest. As you make more deposits, you get compounded interest. I care very little about the upfront payment for the article; the income it generates over time has the most value to me.