Quick, log in to your Google Adsense account now, go to "Reports > Overview," then scroll down a bit. What do you see?
You've got mail! From Google Adsense!
Google Adsense started sending today customized optimization tips to Adsense publishers.
More specifically, our system will automatically analyze your account and ad settings. Based on these findings, you'll receive a notification each month in your Adsense account if there are changes you can make to improve your overall Adsense performance.
Screenshot of this new section in Adsense and their personal message to me after the jump.