Auditd gives you the ability to write your own custom audit rules. This functionality allows an administrator to keep a close eye on system calls, file access, and user behavior. This added functionality is especially useful in environments that are requred to adhear to compliance standards that are above and beyond normal standards. Think PCI.
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How to Configure Alerting on TouchDown for Android
I have had a Blackberry attached to my hip for longer than I care to remember (before that it was a motorolla pager, yick). As a systems administrator, email alerting from exchange has been a functionality that I must have working without too many issues or too much hassle. Missing an alert email to 4 am is just not an option. However the call of an real smart phone was just too much for me and I decided to get rid of my blackberry and get the HTC G2, after talking to several folks who use TouchDown for connecting to Exchange.