Log File Analysis

["Mark C Carollo" <mcarollo () csiu org>]

I am looking for suggestions on programs that will analyze IIS log 
files.  I want to be able to detect intrusion attempts/code red/nimda/etc. 
and output it in a format that is easy to understand so I can find 
trends.  The program should be able to analyze multiple log files at once 
(i.e. log files are created daily and I want to be able to analyze a month 
or a year at a time).

-- Mark