Just recently, Google Adsense revealed how they share revenue with their business partners like us. At least they are transparent enough to let bloggers like us know how much earnings we can have if we partner with them.
They revealed how two of their products shares are being divided, these are adsense for content and adsense for search. Adsense for content gives 68% to publishers while adsense for search give 51%. So there, now that we know how much we are getting lets all enforce our traffic and let those folks click our ads. Imagine how much we can get when we have a good traffic on our blogs.