A couple of publications from Russia's RAS and the Kurchatov Institute, and one from the Netherlands, are available in pdf format on Marvin Herndon's web site, nuclearplanet.com
G. Domogatski, V. Kopeikin, L. Milaelyan and V. Sinev, "Neutrino Geophysics at Baksan I: Possible Detection of Georeactor Antineutrinos" arXiv.org (January 28, 2004).
And also arXiv.org (March 17, 2004).
R. J. de Meijer, E. R. van der Graaf and K. P. Jungmann, "Quest for a Nuclear Georeactor", arXiv.org (April 8, 2004).
It appears that interest in this is building world-wide.
Exciting times !