SoundWorks Collection has a wide array of videos with interviews and inside looks at not only sound design, but music as well. Be it film or trailer, you can find some very intriguing videos here.
If it's about audio that's worth noting, you can find the topic here.

Interview with Composer Yoav Goren (Immediate Music)

http://soundworkscollection.com/videos/yoavgoren

All videos for SoundWorks Collection are hosted through Vimeo for the highest picture quality available (kicks YouTube's ass).

SWC on Vimeo:

http://vimeo.com/soundworkscollection

Any trailer music fan should really enjoy this video and get a good idea of what goes on when they work on trailers.