A good article on MSNBC reviews why just about all work from home jobs are actually scams. These jobs include at-home sales, packaging, mystery shopping, and other classic scams. Definitely not real jobs, these crooks are hoping to lure you into providing them with your information for identity theft and/or bank information. If it sounds too good to be true, it probably is.
The Better Business Bureau has a nice little section that specifically addresses the Most Common Work-at-Home scams being seen online and offline.
The National Consumers League maintains a great website that addresses Fraud and Internet Fraud. In addition, they also have a specific page on Work-at-Home Scams.