One of the areas that I am enjoying working with is the Security and Compliance components built into Office 365 and of course Azure. I just posted a few posts over at SharePoint Pro that are about this very topic.

Data Loss Prevention
http://sharepointpromag.com/sharepoint-administration/security-and-compliance-office-365-data-loss-prevention

Reporting
http://sharepointpromag.com/sharepoint/security-and-compliance-office-365-reporting

Security and Permissions
http://sharepointpromag.com/sharepoint/security-and-compliance-office-365-security-and-permissions

Administration
http://sharepointpromag.com/sharepoint/security-and-compliance-office-365-administration

More posts to come, on some of the more advanced features such as Advanced Security Management and Cloud App Security