I just finished listening to the entire interview and was very pleased with it. The beginning segment goes inton TIG quite a bit and later segments cover a wide variety of topics like his voice and experience doing Smaug (he does do a bit of the "voice" and explains that it is actually painful for him to do it), what it is like being famous, working with Martin, transforming himself into Julian Assange and other interesting tidbits.
Really lovely overall.
And of course it is so comforting just hearing his melodious, rumbling voice fill my parlour for 30 minutes!
-Val