I am a fan of the Eta Tau podcast, a German podcast (sometimes German language, sometimes English language) on various technical topics. Very in-depth discussion of technical issues with experts in different fields. The host had a nearly 3 hour conversation in English with various people at Toyota Motorsport GMBH. The interview starts with Alastair Moffitt, then proceeds to a number of engineers, with an in-depth discussion of various aspects of racecar design, as well as some insight into what TMG's facilities and their various business activities. Definitely a worthwhile listen for technically-minded Toyota LMP-1 fans.
http://omegataupodcast.net/2015/04/170-race-car-design/