I don’t know how many times does Google AdSense down. Last night I can’t login to my account because it was down. And recently, it down again. I think Google is conducting more upgrades to enhance the usage to publishers.
A few days ago, Google announced that publishers can use up to 5 channels on one AdSense code. With this new feature, publishers can track down their ads performance to improve their earnings. [tags]google, google adsense, adsense[/tags]