Google Sites is a free product that let you create website, publish web pages with the click of a button, edit web pages like documents, and add videos, presentations, and calendars to your pages. Google now allow placing AdSense ads on Google Sites to earn money. After you've built site and ensured that it complies with program policies, follow instructions to add AdSense. You'll have option to place ads in the sidebar as well as the main content of each page, and you can choose the formats that work best for your site. Also, check optimization tips to maximizing your site's revenue.