Are you looking for a free Advertising like Google AdSense/AdWords, just without paying a Cent.
Today I found something like that and its totaly free. You exchange Advertising, like that from Google on your Homepage and your Advertising appears same on other Homepages.
The Technic looks very cool and professional and I gave it already a try.
Here is the original Advertising from the Company:
” AdGridwork is a Free, Online Advertising and Link Exchange Network. We provide an automated service that serves your Ads and Text-Links on thousands of quality Blogs, Websites and Startups! ”
And here is the link to go: http://www.adgridwork.com/