Fair question. I'm running couchdb for a new project, and Lucene is the 'blessed' search backend for that.<p>However, (at least via couchdb) Lucene needs a whole JVM of its own, and I'm planning to run this on a VPS with pretty tight resources. A couple of MB in the same JVM as my site is a whole lot more appealing, and has the additional advantage of using native data-structures directly.