Blending your contextual ads into your content is an extremely effective way to get people to click on your ads, and earn you money. A Cre8asite Forum thread named Adsense Blending, Example Site shows an example of a site that deploys it better than any other site I have ever seen. Here is the test, visit this site and let me know how long it takes for you to find the contextual ads?
Find it yet? If not, here is a picture highlighting them. The forum discussion then goes into, if this is going overboard and is it possibly against the TOS? Either way, this is one heck of a blending job.
Forum discussion at Cre8asite Forums.