Google moved the content network placement feature into the mainstream today by adding a new tab to the standard AdWords interface.
The content network has had considerable attention from Google over the last year or so in an effort to make it more accessible, flexible and transparent for advertisers using it and the unveiling of this new tab represents their confidence in the new improved network, well that and the earnings potential it has for them!
Once you log in you can take a look at the placement tab and find relevant sites running AdSense to place your ads on, it’s just a case of locating the sites by one of three routes.
1) you can browse categories to locate relevant sites
2) you can search by keyword(s) for sites
3) you can search by URL(s)...