For those of you looking for more serious work at home opportunities, something more like a real job, the WAHM (Work At Home Moms) forums are the best place to start. They list legitimate companies that hire telecommuters and at- home workers with a variety of different skills. I got my first at-home transcriptionist job through WAHM, for which I will always enthusiastically recommend their site.
To conclude, by making use of a multitude of these sites, it's possible to bring in a significant amount of money each month. Since many of them also have paid referral programs, you can increase your income by inviting other users to join. As with most pursuits, you'll get out of these sites what you put into them. A little extra work in the beginning can pay off handsomely in the end. Have fun trying them out!