there is some real good news that I really want to share in human-01's blog, as you can see, google labs released a new ads that you don't get revenue for placing them on your website but they will help making your content fresh, they show related videos, news, pages, searches by crowling your page .
an Example of a related ad :
The colors of the ad matches my blog colors, you can change the colors as you wish just like you do with a google Adsense Ad .
Also Adsense team said about the new service :
While Google Related Links don't give you revenue directly, you can use them to keep your site fresh and interesting without any maintenance. Happy visitors mean repeat visits. And if you're feeling especially creative, try alternating between Google ads and Google Related Links in a given space on your page. This will encourage people to look in that space for interesting dynamic content.
Oh, and by the way, you're more than welcome to click the links in a Google Related Links unit on your own site. Happy surfing!
Go there : http://www.google.com/relatedlinks/index.html