msmemory found this indirectly via one of her mailing lists, ultimately from Rotten Tomatoes. The R. Tam Sessions are a rather creepy little promo for Serenity -- all unofficial in the way of modern buzz, but as Joss puts it, "...I also deny knowledge of those things that I wrote and shot and am in." No real spoilers for the movie, but they serve as a sort of prelude to it.
Nasty stuff. Don't read the transcripts -- the movielet is far more effective seen than read. Nicely done: frankly, if River were half this unsettling in the movie itself, she'd have been significantly more interesting.
(Oh -- the Quicktime version didn't work properly for me, but the Windows Media one did. YMMV...)