The proceedings of the first two Omentielva conferences on the linguistics of Tolkien's invetned languages are published in the series Arda Philology, in volumes 1 and 2 respectively. You can preview the full contents of both on this page: omentielva.com/ardaphil.htm. These articles are very technical but full of fascinating material for us 'language geeks.'
(Varda, you might want to include this site among the links. I didn't notice it there.)