Here's a fantastic 19 minute interview of Jarvis and James Brett, the curator of The Gallery of Everything. I assume they've known each other for a while because they were on the Don't Call Me Crazy: How We Fell In Love with Outsider Art panel (interesting if you like outsider art but Jarvis doesn't say much). Both are jumble sale enthusiasts and explain what jumble sales have to do with the discovery/salvaging of outsider art.
From what I've seen this is the most in-depth (and probably longest) interview about the exhibition, with some mention of the book. Really enjoyed this, and I recommend this interview for anybody interested in the exhibition itself rather than just as a complement to the book.
The exhibition will be wrapping up in a few days. It's just a shame that as an Australian I didn't get to see it. I've seen photos of the exhibition's 'bedroom' section and it looks like it's full of photos or posters that mightn't be on the Pulp wiki. Hopefully it finds its way on there eventually!
P.S should this be in the interview thread? Sorry if it should be. It's not a proper Pulp/Jarv Is... interview so I didn't put it there.