I may inform you that our first milestone release of a Lucene (the same core libs as Mussen uses) based search plugin is imminent (summer conference). It supports all of Lucene and eZ publish :-)), including all searchable ezp fields, the ezp role/policy system, and features not available before but most wanted (search across any combination of classes and fields for example). We added also index-time boosting of fields (attributes, metadata) based on ini settings to tune result ranking to specific setups/needs.
