I noticed Google has placed a new feature in my AdSense account this morning. It is called the "Message Inbox" and it shows up directly under your earnings summary on the front page, after you log in. It looks like:
When you click on the "View all messages" link, it takes you to the inbox and that looks like:
Then Google has shared with me a personalized optimization tip, via the inbox that looks like:
It looks to be a monthly email, named "January 2007 Optimization Report." What do they advise? To place more than one AdSense unit on each page and they link me over to Maximize ad space with multiple ad units.
A neat feature that I suspect may turn into Yahoo!'s compliance manager and more.
Forum discussion at Search Engine Roundtable Forums.