We released a new version of TKS today. It included much better documentation on doing searches across metadata and free text indices. There was also some optimization based on our experience with "The World". This is a huge sample of RDF, bigger than dmoz, of all of the places in the world with their details like latitude and longitude. The effect of all of this data had little degredation on its speed. You could also do lots of fun queries like finding out all of the places in Queensland or on the same longitude, etc.