Join oDesk if you want a scam-free work at home job. Just choose the hourly rate jobs over fixed rate jobs. oDesk offers guaranteed pay for their hourly rate jobs so you don't have to worry about not getting paid.
It's also free to join oDesk and you don't have to pay any monthly fees unlike other online job websites.
I've been working at oDesk fulltime for a year now. So far so good... I'm earning more than what I earned from my office job. :) I'm earning at least $300 per week and I know a lot of people who earn more than what I do.
You also can visit my hub or my blog below for tips on how to get started at oDesk. :)