Many people are reporting issues logging into their Google AdSense accounts since Friday and many still can't get in today. For many AdSense publishers, that is a form of torture, of the worst kind. It seems as if Google has changes the manner in which they log people in. When I turn off HTML Refreshing, on my browser, it will not let me log in under Apple's Safari. With it turned on, I have no problems. A six page WebmasterWorld thread has more details. A trick that seems to be working for many, is to login at www.google.com/adsense/login1 instead of the main page.