New York Times published a piece on AdSense today, featuring Shawn Hogan of Digital Point discussing his AdSense earnings (roughly $10k per month) and how he shares his revenue with the members of his forum.
Also noteworthy is the fact that New York Times quotes a very specific revenue share figure, something that Google has always kept very quiet, stating that publishers such as Digital Point earn roughly 78.5 cents on every dollar. There are more details over on JenSense.