I love the Q TV interviews too, probably the best ones to watch if you're looking for a 'proper' interview. I think the first ever full interview I saw of Adele was the Ushi one... Not very informative but at least I laughed a lot!
All her interviews are worth watching/listening but one of my favorites is the one she did with Chris Moyles on BBC Radio 1 right before the iTunes Festival, in June 2011. It's them just chitchatting really but I think that's what makes it special :) I laugh almost through the whole thing. http://www.youtube.com/watch?v=d2IkIjZA7a8
I was (and still am, to some extent...:P) completely crazy about this interview!! Addicted! When I first found it I listened to it every single day for a long time... And it was seriously affecting my school work since the interview is really long! But it IS really a lot of fun, I still end up laughing the whole thing through, too, even though I know it almost completely by heart, lol :D