I found this project thanks to Raphael’s post Turning a Zend_Log log file into an RSS feed.
Developed by Simone Carletti, ApacheLogAnalyzer2Feed is a really powerful open source PHP 5 class to parse and analyse Apache Web Server log files. Results are converted into a feed to let users subscribe them with a feed reader. You can define custom filters based on logs data — for instance User-Agent, IP, requested page, etc— and combine them to select just a limited resultset. The class can easily be extended with additional filters and custom feed handlers.