Wikipedia or reuters like index for testing facets?

[Jason Rutherglen]

Is there a standard index like what Lucene uses for contrib/benchmark for
executing faceted queries over? Or maybe we can randomly generate one that
works in conjunction with wikipedia? That way we can execute real world
queries against faceted data. Or we could use the Lucene/Solr mailing lists
and other data (ala Lucid's faceted site) as a standard index?