Log Parser
I was playing with Log Parser tonight and I did a search to see what I may have said about it in my blog. I was surprised to find that I haven't mentioned it at all. If you haven't used Log Parser before, it's a great way to analyze security and other data on your machines. You'll find a folder full of sample scripts in the install folder. Here's a link to the download center page:
Log parser is a powerful, versatile tool that provides universal query access to text-based data such as log files, XML files and CSV files, as well as key data sources on the Windows operating system such as the Event Log, the Registry, the file system, and Active Directory. You tell Log Parser what information you need and how you want it processed. The results of your query can be custom-formatted in text based output, or they can be persisted to more specialty targets like SQL, SYSLOG, or a chart.
You can find out more about Log Parser at The Unofficial Log Parser Support Site, Logparser.com. There's a KB, a forum, and other resources of interest. Be sure to check out the article by Gabriele explaining how it works. Have fun. :)