I just did a Webinar about Oracle Database Security (free of charge, one hour duration). We have had some technical problems with the audio and therefore a delay, though, for which I have to apologize. I have talked there about the following:
Standard Auditing (AUDIT_TRAIL parameter)
sys Auditing into an OS file, owned by root (AUDIT_SYS_OPERATIONS & AUDIT_SYSLOG_LEVEL parameter)
Fine Grained Auditing (DBMS_FGA package)
Transparent Data Encryption for columns (10g New Feature) and tablespaces (11g New Feature)
You may download the presentation of that webinar together with my demonstrations as PDFs from here, if you are interested.
Also, I have placed a link on the downloads page to the recorded Webinar. By the way, I usually do those Webinars & LVC courses with a Webcam, but during the troubleshooting measurements in order to get my Headset running under WebEx, we switched the Webcam off.
Click here to view the Security webinar recording online