The basic idea, as far as I can tell, is that users can participate via text chat while the seiyuu interact in a live online radio show. Sounds kind of fun, even if I'm not very familiar with any of these seiyuu. Would you check it out? Or perhaps the better question is...what seiyuu would they have to have in order to really grab your interest?
(Marina Inoue Marina Inoue Marina Inoue!)