It's great to see the constant roll-out of capabilities across the Azure platform.
One in particular that many have been waiting for is Active Directory. Scott Guthrie posted today that it's now available for production use. This is particularly significant and also enables options for on-premises directory sync and federation. If you have been using Office365, you have already been using Azure AD.
Scott also mentioned that they are about to open a preview of a link from OAuth 2 (or OpenID) to Azure AD. That will enable you to use alternate credentials (such as Twitter credentials) to authenticate against Azure AD.
They have also added an Azure Backup option and added a variety of monitoring options for Azure Websites, including the ability to retrieve website logs via FTP.
Scott's post about this is here: http://weblogs.asp.net/scottgu/archive/2013/04/08/windows-azure-active-directory-general-availability-new-backup-service-web-site-monitoring-and-diagnostic-improvements.aspx