Do humans do it better?
Tap looks a lot like Alpiri. The reason it turns out, is that Alpiri is Tap. The Alpiri.org redirects you to tap.stanford.edu.
Paper on Tap presented at W3C:
http://tap.stanford.edu/w3c.html (I typed Tim into the search bar)
After the stirring debates caused by the humourous Metacrap paper. I went looking for some human generated metadata repositories. Sure there's dmoz and such but one based on files (as the Metacrap's examples gave). It seems that Bitzi is such a site. Funnily enough it's music, text and DivX files. They have a program that you mark-up and describe the files on your hard drive.
Bitzi Top 100 (Memento, Jurassic Park 3, lots of novels):