Get to the Admin console more easily with the new, simplified URL (admin.google.com). The admin console now supports multiple sign-in, so admins who manage multiple domains can quickly switch between accounts.
Note: The old Admin console URL (www.google.com/a/) will automatically redirect to the standard Google login page. When non-admin users from domains that use SSO try to login, they will be automatically redirected to their SSO login page.
For more information:
Google Apps for Business and Government