I have one suggestion for you. Since you are running ZoneAlarm, go to Visualize Software and get a copy of VisualZone. It is a ZoneAlarm log reader. It parses the log entries out in a spreadsheet-type form, with some built-in lookup features (WHOIS and a map feature). It will also do a reverse NetBios lookup on all attackers, if you want!
I use ZA, and I hated trying to read through the logs, until I found VisualZone. I think it will help.
