You could look locally, if there any business who allow remote workers. I was hired at a call center who said you could W@H after 6 months, but that was a lie. The position was filled. You had to apply when they had openings, and they never had any openings (since the past 2 years, I later found out.) So if they say they do, try to find out more about the program or see if you can talk to an employee who already works there before you take the job. That was my only local option, so I turned to the WWW. I would suggest starting at http://workathomemafia.com/
they have an extensive list. If you go with a company that works with a lot of different clients, find out as much about the training and environment before you start. I have worked at home for Working Solutions, and Sutherland Global. Neither lasted very long (one was tech support with NO training, and the other was sales.). It wasn't the companies, but the project I was hired for. Make sure it's something you're comfortable doing.
I wouldn't suggest Craigslist for something like this, unless you want to get spamed with scams. I've also been getting scam emails from CareerBuilder, and Monster.