Hello: I have been working from home for 13 years now. The site is Elance.
You can see me at this address, just so you can see it's the real deal.
It is a place you can set up a profile outlining your skills and then you bid on different projects that are posted. Before I became disabled, I received the bulk of my work there. It is real and there are many people who find success with it. It's not a scheme, but it's not a get rich quick thing either.
It's a genuine place where people are posting various jobs from data entry, administrative assistance to web design. Some projects are short, some are long. I've had great success.
There are other similar sites such as guru.com, but I've had the most luck with Elance. They seem to be more organized, have a lot of things in place to protect the providers, etc. It's the most professional site.
There are also a lot of companies turning to telecommuting to save money.
Also - if you are crafty, http://www.etsy.com is a good start to putting your work up for sale.
If you are good taking photographs: http://www.istockphoto - you can put your photos up and people buy them as stock photography
If you don't want your work as stock photography, you can go to http://www.artistrising.com and post your work.
I also use http://www.cafepress.com - this site is a place if you have creativity, you can create designs to put on a bunch of different products and they sell it for you. You commission structure is not great, but you can make a go of it.
My site there is http://www.cafepress.com/kittygogocrafts
There are always ways out there and not all of them scams. Keep your eyes open and you may find just what you are looking for!