The recently released National Geographic DVD special on the movie Fellowship of the Ring shows evidence that the Kalevala greatly influenced J.R.R. Tolkien's writtings about Middle-Earth. It seems Tolkien was fascinated by the Kalevala during university and many of the finnish myths have significant equivalence on Tolkien's ficcional myths.

On the DVD, they show the last elder who remembers most of the Kalevala by heart and the village that kept the legend alive for centuries. It quite interesting, as it seems the finnish tales were greatly responsible for the elvish culture, looks and songs. The DVD comes in the killer set of the extended version of the movie (and before anyone asks, I'm not in any way financially involved with New Line Cinema nor Peter Jackson).

Much more info on this @ The Mythological Origins of The Silmarillion and Unfinished Tales