Learn About the Google Content Network
AdSense publishers might find the Google Content Network webinar interesting. It explains what the Content Network (i.e. us AdSense publishers) is to AdWords advertisers. Many advertisers have ignored (deliberately or not) the content network because of click fraud and made-for-AdSense (MFA) concerns. With the recent improvements in the way Google is handling the costs of advertising on the CN, they're trying to re-introduce advertisers to the CN. The presentation is seven minutes long, so take a look. If you've never played with AdWords (though I recommend you do) then you'll learn a few things about what advertisers can do with AdWords.
Sponsored Link: Learn about AdSense arbitrage with the AdSense Arbitrage and Leveraging ebook.
Eric Giguere wrote Make Easy Money with Google and Uncommon AdSense. His goal is to get his AdSense blog into Matt Cutts' blogroll.