I saw kimmehs post and terra I know you asked so here goes!!
Rentacoder
you need some pc knowledge but they do have dataentry project that start off at 10$ in the begginning you need to build your status so you start with cheaper jobs and go up you need to build a rep.
Btw its like ebay you bid for the job so if you have good feedback and dont charge that much youll get that job...
For people who are extremely pc literate they have jobs designing webpages, building interfaces, software changes that pay min100$ per job done and its nothing extremely complicated
you get paid by paypal when you do the job the money is held so if you follow the persons instructions and they are dissatisfied you will still get your money!