Google AdSense represents a small revolution for site publishers. It makes it absurdly simple for the average site owner to add some advertising, and share revenue with Google. As you probably know, Google indexes the page and decides which ads to show. For example, this page about double-sided DVDs shows ads for digital media.
Up to now, there was no way for advertising buyers to ensure that their ads appeared on a particular site. Instead, they just bid on keywords. That, as Dave Taylor reports, is changing:
This also bridges a very important gap in the AdWords program because it finally lets potential advertisers who see a group of AdSense advertisements how they can be included. Sophisticated online advertisers scoff at this because they can already recognize an AdSense block at 100 paces, but the majority of potential online advertisers are lost and find the complexity of bidding and advertising in a pay-per-click (PPC) world hopelessly baffling.
I occasionally get requests from companies who want to advertise on this site. I never reply to them, because I’m happy with the basic Google ads I run. Now, however, they can do so without even asking me (presumably I’ll be able to refuse ads I don’t like, though).
DarrenBarefoot.com 
Sadly, I’m at the stage of being pretty open to any ads. Since I’ve started with AdSense, I’ve made about $30 bucks. I’ve been using it since June. *whimper*