The downloads for the episodes (well, just episode 1 currently) are available in 5.1 surround sound!
Pity I only have a quadraphonic setup. Unlike a Dolby Digital feed, I'm not able to route the center channel and subwoofer stuff to the main speakers. I have another set of speakers I can use to get the center channel, I guess, but it just wouldn't match up right. I'll have to resort to listening to the stereo version. I intend to have my computer recording itself, and it won't record anything better than stereo anyway.
Ooh, I did just hear that, of course, they're using the UK dialogue, so Americans unaware of some of the censorship present in their editions of the novels will be a bit shocked. "Arthur Dent? Arthur Philip Dent? You're a jerk -- a complete arsehole."
OK, well, I better get to setting this up!