I created a new plugin for the Audit Viewer which sorts the audit trail into users and their sessions. This will help you to dig through the data, and follow a single user seesion much more easily than you can by looking at the chronological view.
Here is a new snapshot of the "session view":
One thing that isn't showing on the image are the tooltips[1], which gives you additional information. In this case the session folders show the timestamp of first and last audit record in that session, while the individual audit records show the timestamp of that record.
[1] tooltip, a.k.a. baloon help. Text that shows up under the cursor when you position it over something.
