I guess they won't be visiting the Yangtze River
Oh, WOW! This is so made of WIN!
Last Chance to See, Revisited with Stephen Fry and Mark Carwardine
I have a source for the show, but if someone in the UK were able to rip the original Douglas Adams radio shows on the website for me (or point me to a download) I'd be ever-so grateful... (Even if it breaks my heart to hear them.)