I ran across a mention of this open-source log file analyzer: Lire. I haven't tried it, but it seems quite full-featured. In fact, it may be too full featured. Not content to analyze web server logs, it aims to encompass all log file analysis of any kind. New log file formats can be read by writing a "DLF converter" which reads your new log format, converting it into Distilled Log Format. Then reports are generated by XML specifications somehow. Like I said, it looks very powerful. Anyone have any experience with it?