This looks like a very cool project, just what Moodle needs. Will this be building on top of Zend's Zend_Search_Lucene? They appear to have amended the licence to prevent incompatibilities with the the GPL, so just the fact that it's PHP5-only is a major stumbling block. I'm not sure how that fits into the wider debate about what versions of underlying software Moodle requires/supports but personally I think Lucene-compatibility is very worthwile goal for many reasons.
I strongly recommend Tim Bray's On Search if you haven't already read it, really good stuff. --David Scotson 20:57, 30 May 2006 (WST)
Oh, the Lucene Web Service and Solr are also interesting, though replacing the need for PHP5 with the need for a Tomcat install. --David Scotson 21:04, 30 May 2006 (WST)
