They're all scams. Even though this particular one claims you only pay a small amount for shipping, I have heard of people having their credit card billed monthly for around $70.00. Plus, in order to post ads on Google you have to pay Google to "bid" on keywords.

I have recently written a couple of article listing several ways to make money online - and not the usual, common ways you may have heard about. Also, I know of a site that has a ton of legitimate work from home jobs and ideas.

Here are the resources:

http://hubpages.com/hub/Legitimate-Online-Jobs-Do-They-Exist
http://hubpages.com/hub/Not-The-Usual-Legitimate-Work-From-Home-Jobs
www.ewomanweb.com