Cinemania have my review of the big boxed set Stephen Fry's Inquisitive Documentaries. Is it good? It's Stephen Fry talking about stuff he's interested in, so if that sounds good to you it's very good.
The set includes Stephen Fry In America, Last Chance To See, Return of the Rhino (basically just another LCTS episode), and Stephen Fry and the Gutenberg Press. They're all good, go check out the review if you want more detail on why (it's MAAAAASSIVE is why I'm not going to rewrite it here).