One novel thing about Tolkien's languages: he constructed a root language (like proto-indo-european) and etymologies for them. (See http://en.wikipedia.org/wiki/The_Etymologies_(Tolkien) )

> Slovio is the Slavic version of Esperanto.

Someone doesn't understand the point of Esperanto.

Regardless of the point, the truth is Esperanto's lexicon is mostly inspired by Romance languages whereas Slovio's lexicon is mostly inspired by Slavic languages. It's not that shocking of a comparison.