…this new page provides an easy-to-read account overview in one place. The page also offers something completely new to AdWords â€“ SMS (or mobile phone) alerts about important account events related to billing, disapproved ads, and campaign maintenance. In addition to SMS, you can choose to be alerted online or via e-mail.
You can access this new page whenever you want by clicking the “Account Snapshot” link on the top navigation bar. You can also set it to be the first thing you see when you log in (instead of the Campaign Summary page) by simply clicking the link at the bottom of either your Campaign Summary or Account Snapshot page. If you change your mind, you can always switch back to Campaign Summary by clicking the same link.
More details at the AdWords Help Center.