Seems that the beagle and tracker guys are having a good time of late. Things like this make me wonder if the so called "win" in open source is achieved by loud blog posts. I still don't see a win per se, does it matter if oodles of folks use projectX or projectY. Apart from getting a system to do what you want it to there is very rarely any other ROI from open source.
As an aside, I don't think that using the word triple scares any werewolves. Indexing can be done effectively with Lucene, PostgreSQL or redland, depends on what you want from your index.
The next libferris will also allow mounting web photo sites like flickr and now has f-spot metadata support. Yay, cp'ing images to 23hq via a filesystem and having the remote images tagged based on your local (indexable, searchable, extensible) tags.